Thanks for the extra info.
Is there anything different about the files and folders where it does and doesn't happen? Maybe the types of files?
Is the viewer pane open when you select things? Or are you potentially hovering over the files long enough to trigger the tooltip to appear? Those could trigger code/components to be run which are specific to certain file types and might be why it happens in some folders and not others.
It might also be worth trying Directory Opus 12.14.1 (Beta) to see if that makes a difference, since there is a fix in there for an issue which is hard to trigger (unless using French Windows, where it's fairly easy, for fairly random reasons) but can cause hard to diagnose problems if it is triggered. Ruling that out would be worthwhile (and if it is that issue then the beta will fix it).
I had a look at the second dump but everything looks normal in that one. None of the threads appear to be hung, and the program looks like it is waiting for user input. (Which is how dumps can look with the bug that 12.14.1-beta fixes, so it could well be that.)