I am reposting this from https://indesign.uservoice.com/forums/601180-adobe-indesign-bugs/suggestions/38972206-cc2020-alternate-text-for-hyperlinks

Because despite Adobe's claim it is STILL NOT FIXED IN 2021 16.2.1

"In CC2020 a new function for writing alternate text for links was introduced.
Using this function and generating a PDF Leeds to wrong PDF notation. The alt text in PDF is presented by alt text, which is forbidden in the PDF world, where alt text only should be used for non text elements, e.g. pictures. By presenting only the alt text the accessibility is lost – this is against the goal to hav a better output!

A correct output would lead to a content entry.

Note: Alt text for links is under discussion, as such alt text is not present for all users (it would be read out loud, but you can't read it) – this is not about equal access."

Because this was working and now it is not it opens my company up to legal actions under the Americans with Disabilities Act—FIX IT ASAP!