wierd. havent seen this one yet, but I am glad. I dont do bases from bp’s personally, would be infuriating to see that much work go poof.
It was! Was after I started on Hws, build my first food Base in created and BPd it on server; it was too high so I reinforced the legs I saw not touching, but didn’t understand SI back then or even how to see it.
Worse, it was my 5th Adv Cons that I put on that broke it. 
Lessons!
Ah i have seen this off of blueprint spawn ins, where you try to support a structure by extending the blocks into the ground but it calculates the start point first, and breaks it all? Happened on ice to lindenns base the first time around, and its why we push it into the ground so far now lol.