[Arnavion]

Yes, you can confirm if this is the case by going to "Your data in Youtube" and seeing if your comment still shows up there. If you click the direct link there it'll even take you to the video and highlight your comment. But if you reload the video without the querystring part that identifies your comment, you won't see it. It's happened to a bunch of mine too on and off over the years, and it's not because of negativity or anything.

You can even see it happening to other people - if you see a comment tree that says it has N replies, but then you expand it and it shows less than N replies, the same thing happened to the people who posted those missing replies too.

The same thing happens with my Google Maps reviews too. Google is too lazy and high on their farts about letting automation do their moderation to care.