Using Planet mods Maraxsis and Naufulglebunusilo.
Maraxsis requires Spidertron Patrols, which requires Spidertron Enhancements. Somehow when Naufulglebunusilo generates its surface, it uses Unknown Key tile-name.ammonia-lava. These tiles can not be paved over by anything.
I tried to get AI assistance in writing a fix,
if data.raw["tile"]["ammonia-lava"] then
data.raw["tile"]["ammonia-lava"].can_be_replaced = true
data.raw["tile"]["ammonia-lava"].collision_mask = {"ground-tile"}
end
However when I made that fix into a custom mod, it failed to start citing "Spidertron Enhancements" as the reason. I am NOT a coder and have no idea on any of this....Just reporting it in case someone smarter knows whats up.