If we use F3 + F4 combination to enter gamemode menu while we are spectating mobs that change current screen filter such as Creeper, Enderman or Spider, we will disable all screen filters completely until we enter another mob.

Steps:

1. Enter spectator mode

2. Go to Creeper, Spider or Enderman

3. Enter gamemode menu with F3 + F4

4. All screen filters are cleared.

I think this one is a duplicate.