1.21.x incompatibility

[Xilth]

Tested on 1.21.1 and 1.21.4, both crash with only enabled mods:
Fabric API
Round Trees Companion mod (yours)

Tested on 1.20.5 and it works

[nbtc971-star]

I'm on 1.21.1 Fabric and it crashes before it can start the game.

[moolooite]

I'll look into this when I release another version, I will admit I only tested it on 1.20.x, it's possible rendering changed or it might even just be that I didn't make a separate version tagged for 1.21.x