Hello
I think the following picture says enough :

This also happend with the chisel blocks : Marble and Limestone.
Maybe you can delay the spawn from your underground "gardens" after the normal block spawns. (Or other ideas :D )

thx

Hello,
can you please re-open the issue?
Because in the current version is happend again.

I failed to report it here, because I thought I reported it to chisel. :)
Chisel-Team/Chisel#718