I might be wrong but as far as I remember the very reason those dynamic blocks work is because you do not edit them in ArchiCAD so its original state can be restored when the file goes back to AutoCAD.
I am wondering what kind of change causes it to not recognize it anymore. I tend to think moving it in ArchiCAD should be fine, AutoCAD it would still recognize it as the original. Maybe even rotating and mirroring would not break it.
But editing a parameter would.
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