It’s the raw game config data. It’s probably related to the inorganic rock bug I replied to there
The config says that the rock penalty should only apply when sown in rocks, but in-game it currently acts like it’s a “near” condition. Let’s just wait for a dev confirmation whether the foliage is a bug or not.
edit: now that I think of it, it’s the same exact bug… Sown on acting as a near condition for the foliage too… I’m stupid.