Applies to ROTN using Cave Generator
Cave roots spawn floating in the air and I suspect it might be the same issue described here:
VazkiiMods#2144

A fix for it was added to latter versions, but I'm not sure if it can be backported to this fork; if it can't, feel free to close this issue and I will eventually find a way around it.

Fix: VazkiiMods@5be4c71