This bug exists since the first release of 1.13 and is still there in pre-release 2 1.15. It affects the way your hand animation doesn't display correctly when you are jumping. I can't see why anyone hasn't noticed this {:O
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Are your sure you have not set View Bobbing off ?

this needs to be fixed, it's so strange when i'm playing bedrock and switching to Java when I play on PC, Java feels so rigid for me
Can confirm in 20w49a.
This is the same as MC-162137, which was marked as working as intended.
Still happens in the latest snapshots.