[code_duck]

This is the way tech companies have been dealing with perceived abuse for years, at least a decade. Instead of telling you what a problem is, they'll just say "something went wrong". Theoretically this is to prevent bad actors from learning the bounds and how to abuse a system. It is similar to shadow banning.

[gblargg]

Sounds like this one just silently corrupts the results. It's more like when YouTube shadow deletes your comments without any notification, it's just gone after a few minutes.

[code_duck]

From what I've observed, 1-2 years ago if you were timed out or hidden (banned) on a live stream, YouTube would show a "you've been timed out or hidden" message above the commenting box. Then it seems they changed that to simply showing your comments as if they were posted successfully, but nobody else can see them, i.e. shadow banning. It's rather obvious on channels with text-to-speech because the TTS bot doesn't say your comments. You can also sign in with another account and see your comment doesn't appear. This involves both automated filtering by YouTube, filtering set up by the channel owner or managing mod, and moderator actions. It's a pretty annoying way to do things.