To elaborate
When I was creating an underwater puzzle and completed it, the plan was to have a breathing station like suspending the water with signs, but when I tested it I can't breath in, just like what you can see in the screenshots.
So my guess to the bug was, if the player was diving and after it floats above the water, the game recognizes you are still diving because you are still in water and continues to reduce your respiration, and it will go back to normal if you go back on a land.
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[Mojang] Mega_Spud (Jay)
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-17073.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
(The linked bug explains that signs cause drowning effect also (bug), that's why your breathing station setup doesn't work.)
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Oh... Thanks for the reply 👍
Hoping to be fixed soon👍👌
Forgot to add that the Respiration works and the bug doesn't apply in open sea if you float and in a closed spaced area like 3x3 with running water