Is this a bug?

I was playing this game and I presumably lost connection. I thought my opponent lost connection at first but it looks like I did. However, something doesn’t make sense; the game shows I ran out of time but also says I played the game’s final move. Did Harry Potter put a curse on my game? What happened here?

That wasn't Potter. It was Draco.

Well, sometimes it helps to renew the site, if your opponent seems to think quite long on one move and you get suspicious something went wrong. Can't hurt.

The same thing happened to me.

Possibly Lichess updated.