Before the huge update I had a mob grinder that worked fantastically, I was getting hundreds of mobs per hour. However since the update I’m lucky if I see one mob! The mechanics are all as they were before and there is no issue that would affect mobs spawning.
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https://youtu.be/kPofG1SLbmI - this is the mob grinder I built

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However, this issue is a Duplicate of MCPE-21856.
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Please describe the mob grinder you have and how it worked. I've never been able to build a functional one on Bedrock Edition.