Hey mojang i just update the last beta, which is 1.12.0.2 . when i open it . the aquatic update pops on the background. It happens when i update minecraft beta this pops the aquatic update. I dont know if its normal or is an issue. Try mojang to check it.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-43963.
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Eventually it will change into the cats and pandas background or Village and Pillage background. Or I might be wrong, did the background change?