Just to make sure we’re on the same page, this is the latest test build, which for us internally has the best avoidance for crashing. All of the previous test builds you may encounter links to are quite easy to crash.
There is still one outstanding crash I’ve reproduced with that build (to be clear, the first one, not the “OldCaret” build), but otherwise I’ve not been able to crash it with normal text editing, even with a zoomed page view.
Sorry this is all a mess, but there are three slightly different reports, and we don’t know how connected they are, otherwise we’d consolidate the threads.