Other buildings kept appearing over my plot, overlapping what I built. It happened multiple times. They were partially visible, like the first half of a house. It was like being in spectator mode going through walls. I couldn't build because they blocked my view. I can't see connection to any activities particularly. Sometimes I joined and it was already there, sometimes I was building when it's suddenly disappeared, and other times it happened when someone joined and was placed on a plot next to mine.
My client version wasn't in the list but it doesn't let me create a report without choosing something.
My version is 1.20.12