When you first join the game and search for a decorated pot it will have no designs on the side, however after you craft 4 shards together the texture will change for all decorated pots in your inventory or the creative menu

Steps to reproduce:
1. Create a world with 1.20 experiments enabled

2. Get 4 pottery shards and craft them together

3. Now all the textures have changed for pot entities even after making a new world, you have to delete the original world to fix it