collect all unnamed edges and find straightest edge

web-bundle/src/main/java/com/graphhopper/resources/BufferResource.java

@@ -588,14 +588,9 @@ else if (roadName == null && !tempState.get(this.roundaboutAccessEnc)) {
                         boolean matchesPreviousEdgeName = (currentIsBlank && previousIsBlank)
                                 || (currentEdgeRoadName != null && currentEdgeRoadName.equals(previousRoadName));
 
-                        if (matchesPreviousEdgeName && !currentIsBlank) {
-                            currentEdge = tempEdge;
-                            usedEdges.add(tempEdge);
-                            break;
-                        }
-
-                        // Collect both named and unnamed edges for angle-based selection when continuing from an unnamed road.
-                        if (previousIsBlank) {
+                        // Collect all qualifying unnamed edges that either match the previous edge name or are the first unnamed edge after a named edge.
+                        // After the loop we will select the straightest edge from this list to continue the path.
+                        if ((matchesPreviousEdgeName && !currentIsBlank) || previousIsBlank) {
                             candidateEdgesFromUnnamedRoad.add(tempEdge);
                         }
                     }

web/src/test/java/com/graphhopper/application/resources/BufferResourceTest.java

@@ -397,6 +397,24 @@ public void testBidirectionalUpstreamPathWhenRequireRoadMatchIsFalse() {
         assertNotEquals(lineString0.getCoordinates()[0], lineString1.getCoordinates()[0]);
     }
 
+    @Test
+    public void testUnidirectionalUpstreamPathWithUnnamedEdgeStart() {
+        JsonFeatureCollection featureCollection;
+        try (Response response = clientTarget(app, "/buffer?queryMultiplier=.000075&"
+                + "point=42.531666,1.520129&roadName=CG-3&thresholdDistance=200&buildUpstream=true")
+                .request().buildGet().invoke()) {
+            assertEquals(200, response.getStatus());
+
+            featureCollection = response.readEntity(JsonFeatureCollection.class);
+        }
+
+        // Expect a single feature collection for unidirectional
+        assertEquals(1, featureCollection.getFeatures().size());
+        // Expect a line string with coordinates to have been built
+        Geometry lineString0 = featureCollection.getFeatures().get(0).getGeometry();
+        assertNotEquals(0, lineString0.getCoordinates().length);
+    }
+
     @Test
     public void testBidirectionalUpstreamPathWhenRequireRoadMatchIsFalse_InvalidName() {
         JsonFeatureCollection featureCollection;