When a spawner tries to spawn random flashes of fire will appear outside the spawner.
Steps to recreate:
1)With cheats, give yourself block 52
2)Place it
3)Fly around and flames will appear quite far away from the spawner cage
EDIT: Also happens with torches.
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I believe this is the intended behaviour. How far away from the spawner are these flames appearing? Please post a screenshot.
The flames appeare from around 3-20 blocks away. It is extremely quick, less than a second but i will try to get a screen shot.
Particals seen very far away from spawners underneath the player.
I used a 3x3x3 cube of spawners to exaggerate it, I managed to get a screen shot after 10 minuites.