If you have any form of lava (source block or flowing) atop any block, and you walk beneath the block under the lava, your screen will go red and display as though you are swimming under lava. The controls, however, are not slowed, and you do not catch fire or take damage.
Conversely, if you are actually swimming in lava (Provided your eye level is within the topmost lava block or the one directly below it), you catch fire and take damage, but your screen doesn't turn red, and you can clearly see the inside of the lava block.
Bottom line: The red screen with lava has an "Off- by- Two" Error.
Linked issues
duplicates 1
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Comments 2
I did search, but apparently was searching in the wrong place. (I think I'd been searching the bugs for scrolls, or something).
I realized my mistake after I'd already submitted this, and I then re- searched the right area and found that what I'd just said was a duplicate. I came back to mark it and found that you'd already done so.
Sorry! (And way to be quick and efficient! 🙂 )
Duplicate of MC-47520 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.