Grouping rotated objects makes them shatter

I have several simple flat objects. Each one is rotated a different way, and some are rotated about 2 or maybe 3 axes. When I group them, 90% of the objects are where they're supposed to be, but the last 10% is missing from the objects and scattered around as thin shards. 

Is there a workaround? Does TinkerCAD know about this bug? Thanks.


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