I have had the same problem. I made the backpiece for part 1 way before today’s patch. I had the cultivated seed in my player’s inventory in a 20-slot invisible pack. I finished the story part of part 2 and got the three new items and have “charged” all of them as well. Didn’t notice the change in the seed until I got the chaos infused clay pot and it wouldn’t plant the seed.
I really hope I’m not going to have to spend the laurels and re-make the first backpiece again…