[MC-215522] Mob Spawners Not Spawning Mobs

I am currently playing on a server and found a place with 2 skeleton spawners close to each other. I created an XP farm but every once in a while, one of the spawners simply does not spawn mobs. The mob inside just spins faster and faster then slows down without any mobs spawning. So far, when this has been notice, the only way to fix it was to restart the whole server. To get to the spawners, I have a nether portal next to the spawners and in their "activation" range. This could possibly have something to do with it?

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[Mod] violine1101 2021-02-14T23:00:00Z

Are there any light sources near the spawners?

Luigi_138 2021-02-14T23:47:03Z

Bother spawners are completely dark. Both have also stopped spawning mobs at least once and both required the server to be restarted.

tryashtar 2021-02-23T07:45:48Z

Please include screenshots or better yet, a copy of the world

Luigi_138 2021-02-24T01:22:08Z

Can't upload the world since it's over 200 MB but i've posted a few screenshots, the area near the door is light level 7. The world was a server when the problem occurred, not sure if it could be a server side issue.

tryashtar 2021-03-02T08:07:08Z

Unfortunately without a copy we won't be able to reproduce the issue, could you put it on mediafire or somewhere?