--- sc/source/core/data/document.cxx	
+++ sc/source/core/data/document.cxx	
@@ -1479,6 +1479,9 @@ void ScDocument::CopyToClip(const ScClipParam& rClipParam,
             pDrawLayer->CopyToClip(pClipDoc, i, aObjRect);
         }
     }
+
+    // Make sure to mark overlapped cells.
+    pClipDoc->ExtendMerge(aClipRange, true);
 }
 
 void ScDocument::CopyTabToClip(SCCOL nCol1, SCROW nRow1,