When looking through portal blocks, water is not visible.
In the screenshots you can see both water and lava while looking through a portal and while looking around it (lava does stay visible)
This might be a feature, but there is nothing written about it in the wiki.
Nice way to look underwater though.
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This has been in the game like forever.But confirmed

Duplicate of: MC-1379 - Please use the search function to see if your bug has already been submitted.
Currently over 50% of tickets are being closed as duplicate.