What I expected to happen was...:
If the inventory is dirt and press the middle mouse button on a block (any block) then up in the hot bar is not possible. (Survival).

What actually happened was...:
But there is a bug that block gets to hot bar (press the middle button)
in the inventory it's there but not visible.

Steps to Reproduce:
1. switch to survival.
2. Break for example 5 blocks dirt
3. put it in inventory but not in your hot bar
4. Find the dirt and press the middle mouse button on the block.
5. 5 blocks appeared in a hot bar but if you try to put the blocks we put a number out.
6. Look in your inventory 5 blocks of land (they are invisible) if they found you again.