> The problematic case is that very often now it accepts your comment without any errors and... Then nothing. Your comment will never ever show up. The system swallowed it. Whole. Without chewing.

Huh. I've never seen that. Does it not show on your user page even? I've known it to take a few seconds for comments to show up, and mods on certain subs love to silently delete comments (sometimes automatically), but I've never seen them just disappear.

Not the thread, not the user page. Nowhere. Just gone.

I do also have the case where it disappears but a refresh / going to the user page will show it, i.e. something async on their end was just a few milliseconds too slow or something.

And posting the exact same comment again (I c+p them now) works. So it wouldn't be any automatic removals and it's too fast for manual removals.