The bug
When the player is affected by darkness and an end flash spawns, the darkness pulsing effect causes the purplish light to become extremely saturated.
Steps to reproduce
Go to the end.
Execute this command, ensure you have darkness pulsing at 100% in accessibility settings.
Await until an end flash spawns.
Expected result
The purplish light would become darker instead of purplier.
Observed result
The purplish light does indeed become purplier.
Can confirm