The weird thing as you can see on the screenshot, I haven't see this before. And the buble HUD appear when you are on creative mode in underwater.
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No, I'm not in swamp. Just in underwater on normal biome and if you can see the weird thing in the screenshot
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-23949.
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duplicate https://bugs.mojang.com/browse/MCPE-23850