The bug report form requires a screenshot or save file to be submitted. I may be reading into this too much, but if you try without a screenshot or save file it returns the rather sarcastic error message: "You are submitting a bug report. Please attach a file demonstrating the issue such as a save file or screenshot.").
However: 1 - Clearly a screenshot is useless for evidencing a bug of this nature... 2 - Furthermore as far as I am aware, you cannot copy individual saves of PS5 games off the PS5 to a USB in order to get the file onto a PC to upload it to their form. This feature is only available for PS4 games. I tried to see if there was a way around this - but as no solution was evident, even if it is possible its far from convenient...
Since I've continued a crosssave from my PC, I've uploaded the PC save, but you could upload a video as well. Even record it with your phone or something.