Switching items with the number keys updates client side, but not server side.

Using the number keys to switch the items appears to work client side, but when you place the block / use the item / break with the item, it reverts the block to the one that used to be there, but it doesn't update the hotbar or inventory client side.

EDIT: Footage of the bug currently uploading at https://youtu.be/85we8gNBYjo