Random Crashes when processing videos.

[Selur]

[av1 @ 0x6319fdb83540] Your platform doesn't support hardware accelerated AV1 decoding.

Doesn't seem like a problem, since the decoder call never requested hardware decoding, so ffmpeg should use software decoding.

[av1 @ 0x6319fdb83540] Failed to get pixel format.
[vist#0:0/av1 @ 0x6319fdb4c980] Error submitting packet to decoder: Function not implemented
[av1 @ 0x6319fdb83540] Missing Sequence Header.
[vist#0:0/av1 @ 0x6319fdb4c980] Error submitting packet to decoder: Invalid data found when processing input

seems more like an issue

If you also have a proper setup Vapoursynth environment (suitable to Hybrid), you can try whether it helps to enable 'Filtering->Vapourynth->Misc->Script->Always use Vapoursynth'.
Other than that, you could try a newer ffmpeg build.(newer releases of Hybrid do come with newer builds, but you could also install another ffmpeg version on your system and point Hybrid to it)

Cu Selur