"Protection", "Projectile Protection", "Blast Protection" and "Fire Protection" aren't mutally exclusive as of 1.14. Says on Minecraft Wiki.
*+_Incompatible with
Blast Protection, Fire Protection, Projectile Protection[Bedrock and Legacy Console editions only]_+*
Isn't this supposed to happen though?
This has happened to me as well.
When a brown glass block isn't directly above the beacon, the beam looks light-gray
Is it because the lava is 1 block deep?
can reproduce in 1.14 and 1.14.1