It seems that farmers don't interact with crops.
I have tested this in two different worlds and modloaders and during this time farmer hasn't planted a single crop.
Mod list:
||alexsmobs-1.21.0
citadel-2.1.1-1.19
create_jetpack-2.1.1
create-1.19.2-0.5.0.f
kotlinforforge-3.7.1-obf
rubidium-0.6.2
RubidiumExtra-1.19.2-0.4.11.44
smarterfarmers-1.19.2-1.7.0
configured-2.0.1-1.19.2
moonlight-1.19.2-2.1.13-forge
textrues_rubidium_options-1.0.3-mc1.19.2||