BUG: Acrobat DC randomly making text or images disappear when changing reading order
When reordering the reading order of items on the pages of an audit report, Acrobat randomly removed text on pages that I wasn't even looking at. I tested it out on another file and discovered the text disappears when you hit save. Up until then everything appears fine.
Acrobat was also making random layers of embedded pdf maps disappear when when trying to add alternative text, and there is no option to simply edit the SLUG text instead.
Stel Pavlou
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Walter Shamo commented
https://community.adobe.com/t5/acrobat-discussions/random-text-being-deleted/td-p/11219928
Posted this answer before, but figured I'd put it here too. JR Boulay evidently has a fix involving changing the font of the text. While he doesn't explain, it seems that Times New Roman (and possibly Calibri?) is a buggy font. Might be worth a try but I don't use Adobe just because I hear about this issue so often.