diff --git a/lib/merge.py b/lib/merge.py
index 8a8139b..866adf8 100644
--- a/lib/merge.py
+++ b/lib/merge.py
@@ -466,9 +466,9 @@ def _serialize_edge_fields(raw_fm_text: str, merged_edges: dict[str, list]) -> s
 
         if matched_field:
             fields_written.add(matched_field)
-            # Skip the old field and its list items
+            # Skip the old field and its list items (may be indented with spaces)
             i += 1
-            while i < len(lines) and lines[i].startswith("- "):
+            while i < len(lines) and lines[i] and (lines[i][0] in (' ', '-')):
                 i += 1
             # Write the merged version
             edges = merged_edges.get(matched_field, [])
diff --git a/tests/test_reweave_merge.py b/tests/test_reweave_merge.py
index f19c398..e1af896 100644
--- a/tests/test_reweave_merge.py
+++ b/tests/test_reweave_merge.py
@@ -61,7 +61,7 @@ def _serialize_edge_fields(raw_fm_text: str, merged_edges: dict[str, list]) -> s
         if matched_field:
             fields_written.add(matched_field)
             i += 1
-            while i < len(lines) and lines[i].startswith("- "):
+            while i < len(lines) and lines[i] and (lines[i][0] in (' ', '-')):
                 i += 1
             edges = merged_edges.get(matched_field, [])
             if edges: