Camera instantaneously changes position when elytra is deployed, rather than smoothly

Situation as of 1.9-pre1: https://youtu.be/PwAlfJ1anGs

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After jumping off a one high block elytra flight engages for a very short time. The camera switches back and forth very quickly.

http://gfycat.com/ConstantPerfumedAmbushbug
http://gfycat.com/UnequaledLazyAcouchi

Panda says:

I don't think the problem is that it starts to early.

The problem is that the camera position jumps by almost two blocks.

It would be fine that the flight starts if that wouldn't happen.

I think MC-90810 and MC-93031 describe the issue well.