Since new update, my Composter has nothing in the List to set, just the black Search bar.
Edit: Forrester can´t select saplings also

Problem happens again, also Fuel for Bakery / Smeltery from Minecolonies, attached Composter Items to Compost Window. No other Mods as ATM7

Server was restarted, Problem stay the same.

Disconnect and Reconnect to Server seem to fix the Problem- repeatable

After Server reboot, Problem has resolved itself

Minecolonies has been updated in 0.4.31, can you test if the problem is resolved?

Problem seem to be fixed. Thanks!