When i did a ground floor expansion research on gleba, it brought the cliffs and shrubs with the next jump.
https://www.dropbox.com/scl/fi/hnb16cxxwt3bqzqtnn5ox/issue.png?rlkey=d8nz6l36698ri05msf5lggl4m&dl=0

I should add -- this is not a game breaking bug. Just makes me have to research cliff explosives

There is a discussion topic on this from awhile ago.

I always hold an expansion to when I'm going to be in void for that reason.

As you wrote yourself. You can research cliff explosives, so it can be solved. Not sure if I should delete them on expansion

The same is true for trees and other items. I upgraded on Gleba and ended up with some exploding trees that needed to be cleared. Not a major problem but a nuisance.

I have not seen it replicate water/oil/marsh/ore so it is limited to feature placements.

Yes its limited to decoratives. It is a bit annoying, but I found it basically only use for cliff explosives in warptorio, so for now it is still in game. I will probably add setting in future that will disable this behaviour

Honestly i like trying to collect trees to bring with me, so yeah a toggle would be good