I want to give Studio 2019 the benefit of the doubt, since this is an issue with a track record for InDesign. See for example, in the Adobe forums:
- Missing elements in INDD to IDML conversion: https://forums.adobe.com/thread/2098938
- Something that occurs when the 8000th character is “Paragraph Return (\r)” https://forums.adobe.com/thread/2344905
There goes another mysterious software issue...
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