When spectating a mob that has its own custom shader, such as a creeper, the shader is not applied while the gamemode switcher (F3+F4) is open.

Note: I'm unsure about the correct usage of 'shader' in this context with the introduction of 1.17's Core Shaders.

Steps to Reproduce

1. Summon a creeper using a command such as this one: {{/summon creeper ~ ~ ~ {Silent:1b,PersistenceRequired:1b,NoAI:1b}

   }}

2. Switch to Spectator mode
3. Left-click the creeper to spectate it
4. Open the gamemode switcher by holding F3+F4

Observed behaviour

The shader is no longer active