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+            2001,
             1264,
-            1990
+            2254
           ]
         }
       ],
diff --git a/.seed/verifier/1990-04apr2430-page29.bundle.json b/.seed/verifier/1990-04apr2430-page29.bundle.json
index 16ac4b7..44e5c89 100644
--- a/.seed/verifier/1990-04apr2430-page29.bundle.json
+++ b/.seed/verifier/1990-04apr2430-page29.bundle.json
@@ -34,7 +34,7 @@
             0,
             548,
             1281,
-            624
+            651
           ]
         },
         {
@@ -46,9 +46,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            624,
+            651,
             1281,
-            700
+            754
           ]
         },
         {
@@ -60,9 +60,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            700,
+            754,
             1281,
-            776
+            857
           ]
         },
         {
@@ -74,9 +74,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            776,
+            857,
             1281,
-            852
+            960
           ]
         },
         {
@@ -90,9 +90,9 @@
           ],
           "row_bbox": [
             0,
-            852,
+            960,
             1281,
-            928
+            1063
           ]
         },
         {
@@ -104,9 +104,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            928,
+            1063,
             1281,
-            1004
+            1166
           ]
         },
         {
@@ -118,9 +118,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1004,
+            1166,
             1281,
-            1080
+            1269
           ]
         },
         {
@@ -132,9 +132,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1080,
+            1269,
             1281,
-            1156
+            1372
           ]
         },
         {
@@ -146,9 +146,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1156,
+            1372,
             1281,
-            1232
+            1475
           ]
         },
         {
@@ -160,9 +160,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1232,
+            1475,
             1281,
-            1308
+            1578
           ]
         },
         {
@@ -174,9 +174,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1308,
+            1578,
             1281,
-            1384
+            1681
           ]
         },
         {
@@ -188,9 +188,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1384,
+            1681,
             1281,
-            1460
+            1784
           ]
         },
         {
@@ -202,9 +202,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1460,
+            1784,
             1281,
-            1536
+            1887
           ]
         },
         {
@@ -216,9 +216,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1536,
+            1887,
             1281,
-            1612
+            1990
           ]
         },
         {
@@ -230,9 +230,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1612,
+            1990,
             1281,
-            1688
+            2093
           ]
         },
         {
@@ -244,9 +244,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1688,
+            2093,
             1281,
-            1764
+            2196
           ]
         },
         {
@@ -258,9 +258,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1764,
+            2196,
             1281,
-            1840
+            2299
           ]
         },
         {
@@ -272,9 +272,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1840,
+            2299,
             1281,
-            1916
+            2310
           ]
         },
         {
@@ -286,9 +286,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1916,
+            2310,
             1281,
-            1992
+            2310
           ]
         },
         {
@@ -300,9 +300,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            1992,
+            2310,
             1281,
-            2068
+            2310
           ]
         },
         {
@@ -314,9 +314,9 @@
           "oddities": [],
           "row_bbox": [
             0,
-            2068,
+            2310,
             1281,
-            2144
+            2310
           ]
         }
       ],
@@ -344,9 +344,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2159,
+            2057,
             2550,
-            2172
+            2159
           ]
         },
         {
@@ -358,9 +358,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2172,
+            2159,
             2550,
-            2185
+            2261
           ]
         },
         {
@@ -372,9 +372,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2185,
+            2261,
             2550,
-            2198
+            2310
           ]
         },
         {
@@ -386,9 +386,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2198,
+            2310,
             2550,
-            2211
+            2310
           ]
         },
         {
@@ -400,9 +400,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2211,
+            2310,
             2550,
-            2224
+            2310
           ]
         },
         {
@@ -414,9 +414,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2224,
+            2310,
             2550,
-            2237
+            2310
           ]
         },
         {
@@ -430,9 +430,9 @@
           ],
           "row_bbox": [
             1281,
-            2237,
+            2310,
             2550,
-            2250
+            2310
           ]
         },
         {
@@ -444,9 +444,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2250,
+            2310,
             2550,
-            2263
+            2310
           ]
         },
         {
@@ -458,9 +458,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2263,
+            2310,
             2550,
-            2276
+            2310
           ]
         },
         {
@@ -472,9 +472,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2276,
+            2310,
             2550,
-            2289
+            2310
           ]
         },
         {
@@ -486,9 +486,9 @@
           "oddities": [],
           "row_bbox": [
             1281,
-            2289,
+            2310,
             2550,
-            2302
+            2310
           ]
         }
       ],
diff --git a/core/page_layout.py b/core/page_layout.py
index 7ea4cff..b67d5fe 100644
--- a/core/page_layout.py
+++ b/core/page_layout.py
@@ -361,14 +361,21 @@ def partition_row_lines_by_quadrant(
     # Correction pass: on some pages `_detect_body_mid_y` lands BELOW the
     # bottom-block hour-jock-cell baseline (the anchor at 0.55h prefers the
     # gap below the cell over the true inter-block gap above it). The
-    # baseline line then gets misattributed to the top quadrant, and the
+    # baseline line then gets attributed only to the top quadrant, and the
     # bottom quadrant's first detected line is row 0's BOTTOM rather than
-    # its top — shifting every row crop up by one.
+    # its top — shifting every bottom-quadrant row crop up by one.
     #
     # Signal: the top quadrant's last spacing is significantly larger than
     # the median row spacing across all detected lines (a normal sequence
     # has consistent spacing; an anomalous jump at the end means the last
-    # line belongs to a different sequence — the bottom block).
+    # line is the printed grid line at the inter-block boundary).
+    #
+    # Resolution: that boundary line bounds BOTH bands and must appear in
+    # both partitions. Add it to the bottom quadrant WITHOUT removing it
+    # from the top: the top-quadrant cropper needs it as row N-1's bottom
+    # endpoint (without it, clean-pairing falls back to median-gap stepping
+    # anchored to lines[0], which on pages with a tall first row drifts
+    # below the true grid by half a row per step — Alex's page-34 report).
     if len(all_lines) >= 2:
         median_spacing = float(np.median(np.diff(np.asarray(all_lines))))
         if median_spacing > 0:
@@ -380,6 +387,6 @@ def partition_row_lines_by_quadrant(
                 if len(top_lines) >= 2:
                     last_spacing = top_lines[-1] - top_lines[-2]
                     if last_spacing > _BOTTOM_BASELINE_REATTRIBUTION_RATIO * median_spacing:
-                        moved = top_lines.pop()
-                        out[bottom_pos].insert(0, moved)  # type: ignore[index]
+                        shared = top_lines[-1]
+                        out[bottom_pos].insert(0, shared)  # type: ignore[index]
     return out
diff --git a/tests/unit/test_page_layout.py b/tests/unit/test_page_layout.py
index 126d05d..c451734 100644
--- a/tests/unit/test_page_layout.py
+++ b/tests/unit/test_page_layout.py
@@ -299,32 +299,50 @@ def test_partition_row_lines_finds_content_in_top_band(
     assert total_top > 0, f"{stem}: no row lines detected in top band"
 
 
-def test_partition_row_lines_reattributes_misclassified_bottom_baseline() -> None:
-    """When the top quadrant's last spacing is anomalously large (the line
-    is actually the hour-jock baseline of the bottom block, misattributed
-    because body_mid_y landed below it), it gets moved to the corresponding
-    bottom quadrant.
-
-    Pages 20 and 25 of the 1990-04 golden set exhibit this: top_left's last
-    spacing is 100px vs median 75. The fix moves y≈2251 (page25) from
-    top_left to bottom_left.
+def test_partition_row_lines_shares_boundary_line_with_bottom_block() -> None:
+    """When the top quadrant's last spacing is anomalously large, the trailing
+    line is the printed grid line that sits between row N of the top block
+    and the hour-jock cell of the bottom block. That same printed line
+    bounds BOTH bands and must appear in both partitions:
+
+      - It is bottom_left's first line (where row 0's bbox needs it as its
+        top edge — without it, the bottom-quadrant crop slides up by one row).
+      - It also remains top_left's LAST line (where row N-1's bbox needs it
+        as its bottom edge — without it, every top-quadrant crop slides up
+        by half a row because clean-pairing falls back to median-gap
+        stepping anchored to lines[0], which on tall first-row pages produces
+        a fixed-step grid that drifts below the true row boundaries).
+
+    Pages 20 and 25 of the 1990-04 golden set show this geometry: top_left's
+    last spacing is 100px vs median 75. The shared-line invariant must hold
+    on both sides.
     """
     stem = "1990-04apr0106-page25"
     image = Image.open(GOLDEN_DIR / f"{stem}.png")
     layout = detect_page_layout(image)
     partitions = partition_row_lines_by_quadrant(image, layout)
-    # bottom_left must start with a line ABOVE body_mid_y (the reattributed
-    # hour-jock baseline). The original first line below body_mid_y was 2352;
-    # after reattribution, ~2251 should now be the new first line.
-    assert partitions["bottom_left"][0] < layout.body_mid_y, (
-        f"expected first bottom_left line to be reattributed above body_mid_y, "
-        f"got {partitions['bottom_left'][0]} vs body_mid_y={layout.body_mid_y}"
+    # bottom_left must start with a line ABOVE body_mid_y (the shared
+    # boundary line). The original first line below body_mid_y was 2352;
+    # the shared line ~2251 should now be the new first line.
+    bottom_first = partitions["bottom_left"][0]
+    assert bottom_first < layout.body_mid_y, (
+        f"expected first bottom_left line to be the shared boundary line above "
+        f"body_mid_y, got {bottom_first} vs body_mid_y={layout.body_mid_y}"
     )
-    # And the spacing from the new first line to the next should be ~one row,
+    # And the spacing from the shared line to the next should be ~one row,
     # accounting for the hour-jock cell baseline at the top.
-    diff = partitions["bottom_left"][1] - partitions["bottom_left"][0]
+    diff = partitions["bottom_left"][1] - bottom_first
     assert 90 < diff < 115, f"unexpected first-row span: {diff}"
 
+    # The same y MUST also remain as top_left's last line — otherwise the
+    # top-quadrant cropper loses an endpoint and falls back to a fixed-step
+    # grid that drifts below the true row boundaries (the page-34
+    # misalignment Alex flagged in the bbox-pathology sweep).
+    assert partitions["top_left"][-1] == bottom_first, (
+        f"expected top_left's last line to be the shared boundary line "
+        f"{bottom_first}, got {partitions['top_left'][-1]}"
+    )
+
 
 def test_partition_row_lines_handles_blank_image() -> None:
     """A blank image returns four empty lists — no crash, no missing keys."""