The Bug:

Sculk catalysts can form and spread sculk when mobs die nearby while the "doMobLoot" gamerule is disabled.

The "doMobLoot" gamerule prevents mobs from dropping experience upon death. Experience is what makes sculk catalysts form or spread sculk, however, they can still form or spread sculk when mobs die nearby while the "doMobLoot" gamerule is disabled.

Steps to Reproduce:

1. Set the "doMobLoot" gamerule to "false" and summon an area of stone by using the commands provided below.

   /gamerule doMobLoot false

   /fill ~1 ~ ~1 ~9 ~ ~9 minecraft:stone

2. Place down a sculk catalyst on top of the stone and summon a husk nearby.
3. Kill the husk and observe if any sculk forms or spreads.

Observed Behavior:

Sculk catalysts can form and spread sculk when mobs die nearby while the "doMobLoot" gamerule is disabled.

Expected Behavior:

Sculk catalysts would not be able to form and spread sculk when mobs die nearby while the "doMobLoot" gamerule is disabled.