When the latest builds of Paper 1.20 or its forks are used with FarmControl, reactive profiles are disabled and the following message is printed in console:

Reactive mode is not supported on Folia

I suspect this is because of PaperMC/Paper@d6d4c78 -- FarmControl checks for Folia by checking for the presence of the region scheduler, which is now included in Paper.

Thanks for the report