diff --git a/tensorrt_llm/_torch/models/modeling_qwen3_5.py b/tensorrt_llm/_torch/models/modeling_qwen3_5.py
index 6fc43129a353..cafaac0537a3 100644
--- a/tensorrt_llm/_torch/models/modeling_qwen3_5.py
+++ b/tensorrt_llm/_torch/models/modeling_qwen3_5.py
@@ -649,6 +649,7 @@ def __init__(self, model_config):
     placeholder_placement=MultimodalPlaceholderPlacement.BEFORE_TEXT,
     placeholders_separator="",
     content_format=ContentFormat.STRING,
+    interleave_placeholders=True,
 )
 
 
diff --git a/tests/unittest/_torch/modeling/test_modeling_qwen3_5_vl.py b/tests/unittest/_torch/modeling/test_modeling_qwen3_5_vl.py
index 57537e004166..425756cbf9e0 100644
--- a/tests/unittest/_torch/modeling/test_modeling_qwen3_5_vl.py
+++ b/tests/unittest/_torch/modeling/test_modeling_qwen3_5_vl.py
@@ -208,6 +208,7 @@ def test_qwen35_dense_vl_placeholder_metadata_registered() -> None:
     }
     assert metadata.placeholders_separator == ""
     assert metadata.content_format is ContentFormat.STRING
+    assert metadata.interleave_placeholders
 
 
 # --- Layered parity test scaffold -------------------------------------------
diff --git a/tests/unittest/_torch/modeling/test_modeling_qwen3_5_vl_moe.py b/tests/unittest/_torch/modeling/test_modeling_qwen3_5_vl_moe.py
index e715c53a3ac2..309afbf5a8d7 100644
--- a/tests/unittest/_torch/modeling/test_modeling_qwen3_5_vl_moe.py
+++ b/tests/unittest/_torch/modeling/test_modeling_qwen3_5_vl_moe.py
@@ -165,6 +165,7 @@ def test_qwen35_moe_vl_placeholder_metadata_registered() -> None:
     }
     assert metadata.placeholders_separator == ""
     assert metadata.content_format is ContentFormat.STRING
+    assert metadata.interleave_placeholders
 
 
 # --- Layered parity test scaffold -------------------------------------------