I went thru and had a proper look. The horses take oats inside the shed like they should. If you have filled the trough with hay, there won't be any room for oats.
After having a look and spawning some stuff in at the various sell points, it seems only a cotton sell point seems to be missing even tho listed. If I were to guess I would say it is setup how it was in 19 with seasons. He may not have set a sell point as cotton isn't grown there. Orrrrr I am just overthinking it and it's merely an oversite to be fixed in an update.
I am not going over the whole thread but if anyone would like my help checking something about the map, just get my attention and let me know what problem you are having and I would be happy to look at what I am able.