Describe the bug
A clear and concise description of what the bug is. minecraft:player_wall_head isn't showing up as a possible block to be added also when looking at the block and hitting add block it doesn't get added to the menu because it doesn't exist. Block doesn't show up in GUI Menu. Finally wont highlight minecraft:player_wall_head only minecraft:player:head

To Reproduce
Steps to reproduce the behavior:

1. step one
   Well go to GUI Select player head and add it. Give player a player head place down the head on the floor block then place one on the side of a wall block. Toggle X-ray to see player head on the floor will be highlighted the player head on wall will not.
   Expected behavior
   A clear and concise description of what you expected to happen.
   I expected to see every player head highlighted when toggling player heads but player heads on walls don't show up.
   Screenshots
   If applicable (delete if not), add screenshots to help explain your problem.
   
   
   

Minecraft Environment

• Minecraft Version: [eg: 1.12.2] 1.16.5
• X-Ray Mod Version: [eg: 1.5.0] 2.7.0
• Mod Pack & Version if applicable
  not sure what what you mean by mod-pack and version?
• Forge Version if applicable
  I think 36.2.39
  Additional context
  Add any other context about the problem here.
  I've noticed this issue on every version beside 1.12 and down.