So this is the second time this has happened.
I log in walk to my base to find three watchtowers just vanished. There is no trace of them. Except the Giant hole in my base ...

My base is quite large consisting of upwards of 3600 nails, 1,800 planks which makeup around 18-20 watch towers , and over 100 fences.

I can provide some after screenshots or video footage.