Using ID v 16.1 on an iMac running Catalina.
To reproduce: I just have to touch any image that has select subject or user-modified path text wrap applied and attempt to move it or modify it in any way. One image just caused the hang by existing, I couldn't work on the file until I deleted it.
Expected result: For the text to wrap around the image without causing program to hang.
Actual result: endless beach ball spinning until I force quit and try again.

I just spent the entire day trying to work on a large project (200 pages or so) with multiple images that have either "select-subject" or "user-modified path" text wraps applied, and InDesign consistently hangs. In all cases it seems to only happen if there is text wrapping (of course why else would you use it?), and some images seem ok until I try to move them or resize them. One, however, just caused a hang no matter what I tried until I deleted it altogether. I will have to revert back to a previous version of InDesign, but in the meantime, what a hassle. And exporting an IDML file just seems to make the problem worse (ie I can't even work in the new file at all, it hangs as soon as it opens). Thank you for your help with this.