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.