I just harvested a field of baby corn, and it won't allow me to plant specifically cotton on the field.
Notes:
Field upkeep - 50%
Baby Corn Harvested
50 cotton seeds (bought fresh from the npc stall)
Cereal seeds will plant successfully on the field.
I'm assuming that the simple work-around for me would be to just plant cereal seeds there first, and then switch to cotton. Still, a minor nuisance and bug. Will check later this week to see if it's repeatable, or just one borked field.