As you can see in the screenshots below, I set up 3 mob spawners.

Namely:

• Zombified Piglin
• Piglin
• Pglin Brute

The only mob still spawning are Zombified piglins when the room is completely lit.

The understanding in the community is that Zombified Piglins are only meant to spawn at light levels 11 and below.  It seems that they are spawning at any light level.  Maybe this was intended but I doubt it.