Thank you, that would mean I can also finally turn biter evolution on xD
I'll post a newer safe file soon

I am aware but this is my first playthrough and iirc that will disable steam achievements

I updated the post accordingly!

Some floor tiles seem to have lost their hidden tile data, thus there is no way to remove them.
- tried right click
- tried bots
- tried nuke

So far I have no idea what causes this and thus also no idea how to replicate it.
All I did was deconstruct a large tiled area using bots and these weird ...