I know there was a bug where comment edits were adding to the new comment count in error. Not sure if that got fixed yet but it could be one explanation for the dodgy comment counts everywhere.
As for your original question tbh I’ve just taken to copying the text of every comment before hitting post, then refreshing the page a couple times to see if it’s really there and if not I can paste it and try again. Brings me back to early 2000s when you could never be sure the forum wouldn’t eat your post, it’s amazing how quickly my automatic copy/paste muscle memory kicked back in!