There's been a few people reporting similar. The theory I've seen is that the game is spawning trees where the ground used to be which are then collapsing and causing a cave-in.
That does make sense. Though it's interesting that the cave in happens in the same location with pin-point accuracy.
its exactly correct, i had the same issue while i was roofing over a place i just dug out for farming
every time a tree grew i got a collapse message
thankfully nobody got hurt all those times, usually there wasnt anyone around
still at 1 death in 10 years (failed artifact due to lack of animal thread, no shearable animals)