When you switch an item in your hotbar using the number keys and try to place the block, the block just dissapears.

To Reproduce: 1. Make sure you're in creative mode. 2. Put a block in your hotbar. 3. Place said block. 4. Switch the block to somewhere else in your hotbar using the number keys. 5. Attempt to place said block, but realise it just dissapears.

Sorry if this is a duplicate, but I couldn't find something similar to this after searching.