Game appears to crash if you run out of sand dunes completely.
(bluesky appears not to accept DMs FYI)
edit: more specifically, I think it occurs when you are building or trying to build sand-dune-required-buildings, after there are no sand dunes (and the little villagers attempt to pathfind to nonexisting sand dunes, leading to a crash)
edit2: Going To Test And See if Reproducible, If So Going to Msg You Again