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[Mungrul]

This is something I've notice I've been spending an awful lot of time doing recently, and can't recall it happening before in the last version I played (probably 4+ years ago).
Basically, once I've pierced the first layer of caverns, I like to dig out rooms for farm plots and livestock 1 layer below fortress ground level. This allows fungus to propagate, creating excellent grazing and fertile soil, while protecting the plots from crazed bands of roving Keas.
However, I've noticed that I get a lot of random holes appearing seemingly randomly in the covering surface layer, meaning I have to be vigilant about patching them.
I am not getting any notifications about ceiling collapses, the holes just appear (maybe when trees are chopped down? But if that were the case, I'd expected a close-knit cluster of holes, not just 1 random square).

In short, what's happening?
I think I may just end up creating wood or rock floors covering these underground plots, but I'm reluctant to lose out on the surface foliage that can grow above them.

[martinuzz]

It's the trees. If there is only a ceiling of natural soil in between a surface tree and an open space below, cutting down the tree will remove the ceiling tile it was growing on.

Has been around for a while, the solution is to build you farm 1 level deeper, with an undug layer in between the tree and the farms, or carefully micro and patch holes with constructed floors as you cut trees.

[Mungrul]

Ah, that makes sense. Possibly a bit late to re-plot my entire livestock and farming infrastructure now, so I'll just floor over those bits that will develop holes pre-emptively.

Thanks martinuzz

[Salmeuk]

after the multi-z leve tree update, one quickly learned to dig 2 z-levels under the surface before branching out, for fear of falling trunks.