The Bug:
Spectating a mob with a shader whilst having a carved pumpkin equipped turns the screen completely white.
Steps to Reproduce:
- Equip a carved pumpkin.
/item entity @s armor.head replace minecraft:carved_pumpkin
- Switch to spectator mode. (F3+N)
- Spectate a mob that has a shader. (Creeper)
→ Notice how your screen turns completely white.