I have a survival world with cheats on that I started in Snapshot 20w08a. Everything functions fine except for one thing. When I swap to creative mode and get near an item I don't have room for when my inventory is full, the item is picked up and... disappears? It's nowhere to be found in my inventory or elsewhere nearby in the world. This can occur with any item, as long as your inventory is full. Seeing this doesn't happen in any other mode in which you can pick up items, I'm led to believe this is unintentional.