vo_gpu-next: shader-nnedi3 make all planes broken

[hooke007]

Important Information

Provide following Information:

• mpv version
  a73e5cd

• Windows Version
  win11 release

• Source of the mpv binary
  built based on shinchiro

• If known which version of mpv introduced the problem

• Possible screenshot or video of visual glitches

Reproduction steps

part of #9390

open the video and apply the shader. nnedi3-nns64-win8x4

Expected behavior

Actual behavior

Log file

gpu-next.log

Sample files

N/A