The issue I have located while playing on creative mode, on January 6th 2022, is in regards with the inventory system. The player inventory is completely fine! It's the storage one that's broken. I had tried to move some of my items into a barrel when I realized that I could only access the first 5 slots on both my own side and the barrels side of the inventory screen. I tested this with all of the chests and shulkers to see if the bug applied there as well. It did. Again, when I just open my own inventory everything is fine and dandy. It's only when I open a storage device that the bug becomes apparent.