Spectator mode players activate mob spawners

Mob spawners will activate when a Spectator Mode player is in range.

Steps to Reproduce

1. Create world with seed = 1994 with Experimental Spectator Mode turned on
2. Enter spectator mode
3. Fly or /tp to spawner (-304 2 52 spider) or (82 69 69 zombie)

Observed Behavior
Mobs will appear around spawner

Expected Behavior
Spectator mode player will not cause mobs to spawn