I have some buildings that are continually collapsing after server restarts since the big update. After some experimenting, I discovered the problem. Pillars are generally only supposed to provide stability to building pieces that they snap to from underneath. Historically, it has not mattered if the pillar snaps to the surface it is sitting on, as long as it touches it.
This behavior appears to be unchanged while building. However, once a server restart happens, any pillars that are not lined up with the building pieces they are sitting on cease to provide stability. This causes buildings that stood up fine while being built to collapse the moment the server is restarted.
(I’ve tried uploading a screenshot to illustrate what I mean, but apparently I’m not allowed to)