Creative flying seems to be broken with the new updates before the aquatic update is released fully. Staying in one spot for too long seems to trigger the walking sounds of the blocks that players run over when playing the game, also it effects not only the flying in creative, its also annoying to land and tap to fly regularly again while building. Please fix with the next update...
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-32391.
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It's already fixed on the 1.5 beta. Wait a few days