The bug
As of the current version, 1.13.2 and in some earlier 1.14 snapshots, they would have their own swimming animation.
But as of 19w14a and b as I recently discovered, their swimming animation has now the normal zombie animation instead of their own.
(F3 is shown as of the different versions)
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is duplicated by 2
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Kind of. But the only thing here is that his swimming animation that you said are his animation.
But right here they don't do their own animation, but instead have the zombie walking animation, just underwater.
Still confirmed for 1.14 Pre-Release 1 - 4.
The animation issue is that the drowned usually bends up and down when following a player/villager, but hasn't done it in the 1.14 snapshots.
Still an issue in 1.19.
Hopefully Drowned can get the swimming animation they have in Bedrock Edition, since right now this is just one of the many, many parity issues Drowned have between editions. Giving them the same swimming animation would at least fix this one.
Does MC-134448 describe your issue?