User context menu showed me a user's comments on other videos

This may be a test I was served, or I don't know how else to explain it. I can't recreate it now but there's no doubt I saw it.

Very briefly while using Youtube on Firefox/Windows, if I hovered the mouse cursor over a usernames in the comment section, an information bubble popped up summarizing the user's activity including comments they had left on other videos. I was really taken aback, but just figured it was something new.

Then it was gone and I couldn't recreate it anymore.

Has anyone else ever seen this and do we want a feature like that? I think I do want a feature like that as it's becoming harder and harder to identify good-faith human commenters worthy of discussing anything with, and being able to see comments they left on other videos would help identify those people.

Interesting because Reddit recently moved in the exact opposite direction, giving users the ability to hide their site activity from other users. Meanwhile maybe Youtube is testing letting users see more about each other.