If there are blocks directly placed on to of a bed, you'll be able to see right through them when using the bed. This can be used as x-rays as you can clearly see any underground structure in the direction of your sight, as long as you are laying on the bed, just as if you were using expectador mode.
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Also affects java (MC-47646.)