I have only tested 1.18.1 for this but it might be a thing in older versions too.
When viewing invisible entities in spectator mob lets you see through water, ice, chests, skulker boxes, and other mobs.
Video showing it: https://youtu.be/J0DjgQkQYzk
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MMK21
Arisa Bot
Thank you for your report!
We're tracking this issue in MC-165958, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. Please check the Fix Version/s field in that ticket to see in which version this behavior was or will be fixed.
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I think that this is a duplicate of MC-165958