Decorated pots have 2 (or 4) strange pixels inside the pot

Decorated pots have 2 (or 4) strange pixels when going inside them in spectator mode.

Steps to reproduce:

• Get a decorated pot and place it down
• /gamemode spectator
• Go inside the decorated pot
• First, go inside the hollow base portion of the decorated pot
• There are 2 awkwardly positioned pixels, as shown in the picture
  
• Now, if you look at the neck of a decorated pot, there are 2 missing/black pixels here too