Hello, I'm playing on version 1.20.1 with the "Rats" mod. The planter rat update does not work in this version.

If you have Mob Griefing disabled the upgrade (and many others) will not work. If you absolutely need mob griefing off for any reason use https://www.curseforge.com/minecraft/mc-mods/more-mobgriefing-options.
If you dont have mob griefing disabled throw me a modlist. Theres a couple "optimization" mods that absolutely ruin rat pathing and i'll need to see if you have any of them

I checked on the build where there is only "rats" and the kernel for it.