I'll preface this by saying I have 206 ooblets on my farm so it could just be from the amount of ooblets, and majority in coops. But I'm having an issue now where the new coops I upgraded and given seeds wouldn't start planting, clearing, or doing anything until I quit the game and relaunch. This will go on for in-game days until I close the game and launch and then they'll all start working as normal.
They are able to work on the plots in the area that are already hoed but they won't even clear rocks or logs in the area around the coops.