I use Raspberry Pi4 2Gb.
When I started to play any video (for example, info from VLC about codec for one of files: H264 - MPEG-4 AVC (part 10) (avc1)) I see red/green dots and artifacts over all screen, see photo.
Kodi interface works perfect, issue only while playing video.
Issue reproduces on LibreELEC-RPi4.arm-9.95.1, LibreELEC-RPi4.arm-10.0-nightly-20210320-e367b4a, LibreELEC-RPi4.arm-10.0-nightly-20210313-c5d7822
Issue does not reproduced on nightly build dated about 20201120. Unfortunately, I deleted image with this version and can’t roll back to it.