That is a bizarre new bug, then. I hope it doesn't become common.
I was RCON'ed in at the time, so I didn't see it. I did asks one of the players who witnessed it, and he described it as "The counter went away, but it's like it was still counting", and that they couldn't move.
I'm hesitant to test the websync again in case that is the problem (although it doesn't make sense that it would be..)