The world we have was created before 1.16. I have started playing on it when it was updated to 1.16. Even then the spawn rates were poor, whether in a mob farm or on the surface. After the 1.16.1 update I took over the server and moved the server from a realm to a dedicated server. The spawn rates have dropped to zero, unless it is in a mob spawner (world generated). I have moved the world to get a newly generated one. The Newly generated world would spawn just fine. I have attached the World files below. So the files are too big, so I uploaded them to Dropbox.
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It would appear you have a chicken cooker somewhere consuming the entire mob cap. Typing the following command into the server deleted the chickens and spawning returned to normal.
kill @e[type=chicken]
BDS-5094 has more information on the Bedrock mob cap if you're interested but essentially the entire server has a cap of 200.
Can confirm. Killed all the chickens and mobs started spawning. Is there a way I can monitor the entity cap?
It would appear you have a chicken cooker somewhere consuming the entire mob cap. Typing the following command into the server deleted the chickens and spawning returned to normal.
kill @e[type=chicken]
BDS-5094 has more information on the Bedrock mob cap if you're interested but essentially the entire server has a cap of 200.