Unexpected Terrain Changes

I've been playing NMS for a long time so I'm no stranger to updates destroying my bases, but I'm used to it happening during major updates. This came out of no where.

I haven't played since the last major Update and Expedition, but I thought I would log in to check on things before the next Update and Expedition were announced. I did not expect to find one of my cave bases in disarray.

Before you ask, no, I didn't use the terrain manipulator, I simply built the base into an existing cave and along the mountainside. Other bases I've checked seem fine so I'm not sure why this one was impacted.

Did this happen to anyone else or am I just lucky?