See FTBTeam/FTB-Modpack-Issues#7171
Is this intended?

DO NOT REPORT AN ISSUE IF YOU HAVEN'T TESTED THE ISSUE WITH THE LATEST VERSION IN CURSEFORGE

Industrial Foregoing Version:
1.21-3.6.24
Titanium Version:
1.21-4.0.36
Crashlog If Applicable (Upload to pastebin/gist):
N/A

Probably a side effect of making stuff plantable

Alright, if there isn't a simple way to fix this (and I assume just removing the moss replaceable tag would break compat with something?), I can close this on our side.

I will look into it

I did a bit of digging and it seems to inherit from the dirt tag, luckily neoforge adds a remove field to tag jsons.