When left click a colony with shears you can only acquire five mushroom rather than a colony as described in the mod introduction, silk touch doesn't work either.

This issues board is only for the Forge version of the mod, as I'm unable to help with the Fabric ports.
You're facing a known issue on Fabric. Please read the pinned issue and go to this board:
https://bitbucket.org/n-horyzon/farmers-delight-fabric/issues