Hello. I am also playing Only Gleba, and the lack of stone has become a major issue, so I am waiting for this mod to be updated as well.
The following changes are needed for Factorio 2.1:
slipstacks.lua
Line 246
- category = "organic",
+ categories = {"organic"},
Line 260
- result_is_always_fresh = true,
Line 270
- {type = "item", name = "slipstack-seed", amount = 1, probability = 0.1}
+ {type = "item", name = "slipstack-seed", amount = 1, independent_probability = 0.1, always_fresh = true}
Line 294
- entity = "slipstack"
+ entities = {"slipstack"}
Thank you!