I was watching a youtuber by the name "Vintage Beef" and he experience an issue where a chicken had wandered into a cave and was laying eggs and zombies would spawn. These zombies would pick up the eggs and this process led to lots of zombies that would not de-spawn. Only thing I would recommend is to remove eggs from the items zombies can pick up. This issue isn't too likely to happen but I thought it should get some attention.
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Thank you for your report!
However, this issue is a Duplicate of MC-175294.
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Doesn't seem to be an issue in 20w19a.