[BLOCKING LIVE CONTENT] Using is_biome test in entity_spawned isn't working.

Verification builds: Release 980905 - 1.6.0 RC0
Summary: When using the "is_biome" filter in the "minecraft:entity_spawned" event doesn't seem to be adding/removing component groups like it's supposed to.

Repro Steps:

1. Download SOLAR 2 from the store
2. Spawn a ghast on the pad.

Observed Results:

1. The UFO will attack you.

Expected Results:

1. The spawn filter should see that it's spawning in the specific biome of the pad which should remove and add a bunch of components that pacify it and make it a rideable vehicle.

Alternate Repro Steps:

1. Download Mutant Battle Arena from the store
2. Change to Mutant Battle Mode
3. go to team ecru side and spawn a bunch of mobs
4. go to llano side and spawn a bunch of mobs
5. open the gates by pressing ready on both sides

Alternate Observed Results:

1. The mobs target you.

Alternate Expected Results:

1. The spawn filter should see that the mobs are spawning in theit specific team biomes. The biome filters in this case control how the mobs families and more components are added and are needed in order for the mobs to fight each other in addition to making sure the teams dont attack you unless in the specified circumstances in the build.

Impact: Using the entity_spawned event many partners use an "is_biome" test to manipulate the mob being spawned in certain biomes. This allowed a lot of flexibility and indeed many partners have used this functionality liberally. This would block the following maps of mine, some of which would have to be removed from the store permanently unless another way to do it was found.

Mutant Battle Arena
Monster Battle Arena
Stranded in Space
SOLAR 2