This is a very bizarre one I've had twice now. At some point in my game a bouncing ball of dirt appears in my base that is constantly growing in size. And I mean constantly. These things quickly become many thousands of Kg.
I have absolutely no idea what causes the bug, but please playtest a little and I'm sure you will spot one.
Steps to Reproduce
Happens to spawn mid-game, no idea what causes it, but I've seen it in both test games I've started so far.
Status: Known Issue
We are aware of this issue and have it logged internally but either we do not have a fix ready yet or we are not planning on addressing the issue in the immediate future.