Missrendering while playing 10bit conent with hwdec (v4l2m2m) in X11

Important Information

• mpv version - current git.
• Linux Distribution and Version - ubuntu-18.04 arm64 on rockpro64 sbc (rk3399 based board),mesa from git, kernel 5.10.12 with patches from openelec.
• Source of the mpv binary - compiled from git.
• If known which version of mpv introduced the problem - it is unknown.
• Window Manager and version - marco-compton.
• GPU driver and version - panfrost from mesa current git.
• Possible screenshot or video of visual glitches
  

Reproduction steps

mpv --no-config -vo=gpu -gpu-context=x11egl -hwdec jellyfish-20-mbps-hd-hevc-10bit.mkv
(there are no issue without hwdec, besides performance),
This movie also plays fine in drm console with:
mpv --no-config -vo=gpu -gpu-context=drm -hwdec --drm-draw-plane=overlay --drm-drmprime-video-plane=primary jellyfish-20-mbps-hd-hevc-10bit.mkv
(mpv use FFmpeg with Kwiboo's patches for v4l2-request and rkvdec)

Expected behavior

Correct rendering.

Actual behavior

Missrendering

Log file

mpv_log_x11.txt

Sample files

https://jell.yfish.us/media/jellyfish-20-mbps-hd-hevc-10bit.mkv

I am completely not sure that issue is on mpvs side, how determine it?

Start by reproducing the command from the issue with the linked jellyfish-20-mbps-hd-hevc-10bit.mkv sample, then compare the X11 EGL result with the DRM command that renders correctly. Read the attached mpv_log_x11.txt and inspect the screenshot to determine whether the failure is in mpv's X11 path or the hardware-decoding and driver combination. Done means identifying the responsible component and a clear next step for fixing or reporting it.