Can't see mob or particles in spawner
Can't see mobs in spawners, look at the screenshot.
Linked Issues
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History14
Added is duplicated by link: MCPE-8902Monster spawner/ no mini mob spinning around in the monster spawner.Duplicate
Added is duplicated by link: MCPE-9783Empty mob spawners emit fire particalesDuplicate
Added is duplicated by link: MCPE-9822Empty spawners on the Nether and sometimes on DungeonsDuplicate
Added is duplicated by link: MCPE-9937Blaze's monster spawner is emptyDuplicate
Removed is duplicated by link: MCPE-9822Empty spawners on the Nether and sometimes on DungeonsDuplicate
Removed is duplicated by link: MCPE-9937Blaze's monster spawner is emptyDuplicate
Added relates to link: MCPE-8998Dungeons appear with an empty spawner and an invisible chestFixed
Resolution: Unresolved → Awaiting Response
Resolution: Awaiting Response → Unresolved
Resolution: Unresolved → Cannot Reproduce

This happens with the blaze spawner in the nether fortresses. Blaze spawners are empty.
@Namitha Kumar: see
MCPE-8998.Does this bug still appear in 0.12.1? If so please respond.
I can confirm this issue affects 0.12.1.
Running Android Kitkat
Difficulty is set to max level on survival. I have not tried to change to creative to see what happens yet.
I have seen 2 types of dungeon spawner issues.
1) there is just an empty spawner cage. No fire and no mob. I have seen this once.
2) there is a spawner with fire particles and no mobs inside cage. No mobs spawn inside the dungeon. Seen this on every other dungeon I have come across.
I have also seen an empty spawner in the nether, just with fire particles but no mobs inside. On the same map.
Seed for this map: 1307477
Head straight ahead from spawn until you come to the village. Go through the village and head right slightly (east) cross the river and there are some visible caves. It is easy to navigate down to the dungeons. They are numerous.
UPDATE:
Created a new world in 0.12.1 and this problem doesn't exist. Could this be an upgrade issue with worlds created prior to 0.12.1?
This issue was reported multiple times. Spawners seem to be empty when you open worlds that were created before the release you are currently using
msbulkresolve
This ticket has been resolved as 'Cannot Reproduce' as it has not been updated recently (1 year+)