This is a very important detail missing from Minecraft. Since we can see the perspective of the Creeper, Spider and Enderman, we should see the Warden's too. So basically the Warden is blind, right? We need complete darkness or something like that...
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We're tracking this issue in MC-249500, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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