If you are in spectator mode and you are in front of lava, nether portals, or water you can see through the nether portal or lava or water, and you can see whats behind it (must be in f5). This also works if you are invisible and you see that invisible player while you are in creative or spectator. Please fix this bug in 1.15.2! here are some pictures 😃
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Same issue as MC-16595
Thank you for your report!
We're actually already tracking this issue in MC-165958, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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