Creakings can spawn with the "spawnMonsters" game rule set to false

Creakings can still spawn when the gamerule spawnMonsters is set to false

How to reproduce

1. Go into a world with both gamerule doMobSpawning and spawnMonster gamerule set to true.

2. Set the time to night

3. Set spawnMonster gamerule to false

4. Spawn a Creaking using Pale Oak Logs and a Creaking Heart

Observed Behavior
A creaking has spawned.

Expected Behavior
The creaking would not spawn since they do not spawn when doMobSpawning is set to false (MC-302243).