I have been using svp+mpv since 2021, and I always used the wheel scroll to skip/rewind...well I can do that in the bottom bar now so I'll get used to it.
Anyway for svp I can confirm that all my upscaled anime make the program crash. I can play normally a 1080 video, but when I open a 4k video and svp kicks-in the mpv windows closes itself.
Anyway I tried to do a reinstall but that doesn't fix that...
Edit: re-install+reboot fixed that...maybe an update gone wrong