If the player is still, breath is consumed as normal.
BUT if the player is in swimming then the breath meter flickers constantly and gets reset to maximum.
Update:In the first video,I was using optifine but the bug still there in vanilla(2nd video)
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We're tracking this issue in MC-165802, so this ticket is being resolved and linked as a duplicate.
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Reporter is able to reproduce in vanilla. See duplicated report.