Crash playing DoVi videos with Vapoursynth filter

[chainikdn]

Important Information

mpv >= mpv-x86_64-20240310-git-a56d8ff 20240304 works ok

probably related to https://github.com/mpv-player/mpv/commit/d9c1e9bc5c8ca5e4a75b197789b77890375cb8e2

Reproduction steps

mpv.com --no-config --vo=gpu-next --vf=vapoursynth=null.py [any DoVi video]

null.py:

import vapoursynth
video_in.set_output()

Actual behavior

crash a few seconds later after playback started:

Assertion failed: comp->num_pivots >= 2 && comp->num_pivots <= 9 in src/shaders/colorspace.c:128

Log file

aaa.log