What happened?

Fireflies spawn correctly as they should in the Nether, but when the spawn egg is used on a monster spawner, they don't spawn at all. I've tried lighting it up as well to see if it was a light-level issue, and it still doesn't work.

BetterNether

9.0.10

BCLib

3.0.14

Fabric API

0.92.2

Fabric Loader

0.16.9

Minecraft

1.20.1

Relevant log output

No response

Other Mods

No response