Some despawned because of the mobcap, but that is it. I think it is too much.
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Thank you for your report!
However, this issue is a Duplicate of MC-137497.
If you have additional information, please add it to that report.
I'm aware that this issue was created first, however MC-137497 contains a better description of the issue
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On deserts there are a lot of places where they can spawn(no trees, grass or decorations that prevent it). And your screenshot looks normal