While I do not know how to disable a paste event, I did click that box that says stop on caught and uncaught exceptions and there is one when pasting. It is caught, because of that there is no error in console, like leafo asked for in the other thread.
This was on Chrome. Maybe it works on some other browser.
Yep. Disabling this makes pasting possible. Something in that chain of events does fire a cought exception when pasting. The exception does not fire, when the event is disabled. It does not update the optional text on paste, only after some key press events.
Failed to execute 'querySelectorAll' on 'Document': '.modal-body:visible' is not a valid selector. at Function.se [as find] (https://static.itch.io/lib.min.js?1730772173:2:7028) ...
So something to do with formatting I guess. There will be a zero width space be pasted, if you paste. So it does paste something, but that something was reduced to a space you cannot see.
