So we’re having this problem in our realm with xp farms from using monster spawner, when we finish our xp farm there seems to be no monster in the spawner anymore and they still haven’t popped back in our spawners and another thing is spiders are spawning on half slabs also
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I've been having this happen too, and wanted to provide some additional information. We are playing on our realm and have built several mob traps around monster spawners. The mob traps function like normal at first, but usually within an hour or so of completing them, we notice there is no longer a monster spinning inside the spawner. Usually mobs will still spawn even when this is the case, however after we leave the area and come back the mob spawner will no longer spawn any mobs at all. I have tested this with 3 skeleton mob spawners and 2 blaze spawners in the nether, all exhibit the same behavior.
We have tried switching to peaceful and back to normal, saving and downloading the realm and then re-uploading, fully lighting the surrounding area, etc.
Let me know if you need any more info.
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Did that work when you restarted the realm because we tried that and hasn’t worked for us yet
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Unfortunately taking the realm offline and re-uploading did not resolve it. I even tested the world when it downloaded locally, and the mob spawners would still not spawn.
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We have the same thing in a slime farm. It did work properly before and nothing is changed in the slime farm.
When you enter the farm for the first time, there are some slimes (1 or 2), but new ones don't spawn. No matter what the moon is like (not even during full moon). If you return another day it is the same.
If you leave, go to peaceful and back, come back during the moon (=night) there are 1 or 2 slimes again.
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This issue is still present for me as well. As stated above, spawners work when initially found, for as long as you are near them. When left for a period of time they don't work anymore. I ran back and forth (about 100+ blocks) with no issue. When I exited and restarted the game the spawner no longer worked. Has happened with every spawn block I've found.
Windows 10
1.2.13
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Yeah, agreed, we still have the issue as well. I have recently built two spawners and left a single block directly below the spawner and both of these spawners have stayed live for the past few weeks. I'm not sure if this is related or the game has simply become more stable with recent updates. You could always try that as well, and see if you see a difference.