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I've a strange behavior as you can see on the 2 attached screenshot.
This figure had 3 dynamic block (magneta) et after copy the "dimension" has changed.
Found Solution : need to do a FLATTEN before copy. In 18.2.14, this problem was not present.
BUT, it remains a problem. The copy is not correct.
Not Solved in 19.1.10-1 (see the test attached). Select all items and copy to a new draw.
I am using V18. But _Audit does find 32 errors. Seems worth a try.