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cech12: I have found the origin of this bug. The problem was, if a dwarf entered the farm, it could happen that grubs leave the farm for a short time. Then another grub was set as "unusable for recipes". After reentering the farm, both grubs were locked. After some time all 6 grubs are locked like this and are not detected any longer. xD

It is fixed in release v1.3 of the BugFix mod.
Until the next release of the DigglesModManager, this new version of the mod must be downloaded seperately.
Yeah, I can confirm grubs are broken in It'd be nice if they'd take the fixes from the bugfix mod and include them in the proper fix.