1. Start a Fabric (0.12.12) Minecraft 1.18.1 server with VMP (0.2.0+beta.3.0) as the only mod
2. Locate a Monster Spawner in the world
3. Go at least 16 blocks away from it, /kill the mobs that are present if needed

Expected:

• Mobs should not spawn, because all the players are too far away

Observed:

• Mobs are still spawning, even though there are no players nearby

It is easier to verify it with a freecam mod on the client side (Tweakeroo), this is how I encountered it