nlmeans_vulkan Filter Generates Artefacts

[solchi]

Summary of the bug: Applying the nlmeans_vulkan filter produces various video artefacts. These video artefacts usually present on the right-hand side of the video as rogue green pixels. Sometimes this behaviour can be found at the bottom of the effected video as well.

How to reproduce:

% ffmpeg -init_hw_device vulkan=vk:0 -filter_hw_device vk -i inputfile.mkv -vf hwupload,nlmeans_vulkan=s=5,hwdownload,format=yuv420p -c:v libx264 -b:v 0 -crf 18 -tune fastdecode -map 0:0 outputfile.mkv
ffmpeg version 6.1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 13 (Gentoo 13.2.1_p20230826 p7)

Zip file contains: full-uncut console output, vulkaninfo, source and effected video and other possible relevant information.

URL to Zip File: ​https://mega.nz/file/4TFTULAK#fyvLj4QdZIHxa3aZiqVsVSSrE07L7o1U4nkxNfnduaM

(Note: other vulkan filters were tested and appear to be functioning as expected e.g. flip_vulkan or gblur_vulkan)