Both A and B tree farms are not working. It may be plugin or they somehow broke. I hope this issue gets fixed soon. Hopefully during next reset.
This could be a bug, if you are not an A-Prisoner and or a B-Prisoner you might not be able to break the wood. I honestly believe they have disabled it as they have taken Tree-Assist down.
Most likely not in the long run unless the staff or someone else clear the leaves. We can't clear them though.