The sequence of letters -xx'-x crashes InDesign 2021 (v 16.0) as soon as you write this sequence yourself, copy or mark a letter from it (e.g. to change the text size) or do a search for this string, in a normal text field.

To reproduce the issue, simply write -xx'-x into a text field in InDesign 2021 or copy it into the text field. The X'x can be replaced here by other normal letters, upper and lower case doesn't seem to matter. The crash seems not to happen if the last X is a special character like ";" or "! Furthermore, there must be two or more letters before the '-x

The Font-Family also doesn´t play a role here. We tested it with different fonts.

Since we have a lot of documents with this letter combination, we cannot edit them in Indesign 2021 anymore. On InDesign 2020 it worked without problems.

Tested with InDesign 2021 (German Version) on different Imacs and Macbooks with macOS Catalina 10.15.6 and Imac with Mojave macOS 10.14.

Extensions and scripts halting or crashing after installing CC2020, due to a missing type library.
Our customers report errors after updating to CC2020, and I got the same error when I tried. Our script make a halt at a DoScript call, with this error: 104705: Unable to load Adobe InDesign Type Library (Version 1.0)
After starting InDesign CC2020 "AS ADMINISTRATOR", a missing type library is obviously created: the message and error disappears after doing that once.
It was not enough for my user just to have administrator privileges on my computer and in the domain, I had to explicitly start InDesign as Administrator.
I found the answer here: https://community.adobe.com/t5/indesign/doscript-error-unable-to-load-adobe-indesign-type-library-version-1-0/m-p/11335921?page=1#M197052

This needs to be fixed in the Adobe installation package for CC2020. Otherwise many script end-user will have to call support and have someone to start InDesign as administrator for them (in case they are not allowed to do that themselves) – it's not obvious to an end user what to do at all when this error occurs.