YouTube has been using an AI filter or so to modify/enhance content of shorts. However, this also causes glitches, like artifacts during playback.

Like this: https://youtu.be/2HY-nREvVu4

Which could be a side effect of: https://youtu.be/86nhP8tvbLY

Seriously makes videos unwatchable and even dangerous for those with epilepsy. This seems to only affect Shorts for now