Dear Istvan,
The problem you described is really a bug. It is forgotten to copy meshes from edges while implementing copying procedure.
I have registered issue #26897 in Mantis.
Thanks for the report,
Commenter-1
Archived discussion
BRepBuilderAPI_Copy and meshes
I have noticed that BRepBuilderAPI_Copy does not even try to copy the meshes of edges. This causes BRepMesh_IncrementalMesh to recalculate the mesh of the entire copied shape, even if the underlying meshes existed in the original shape.
So currently the copyMesh flag is misleading. Is this a bug, or an intended behavior of OCCT?
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