Deceleration / Acceleration in liquid is affected by order of action

Summary:

Deceleration in liquid is affected by order of action.

Steps to reproduce:

1. Hop in pool of water or lava
2. Sneak( or block), and then start walking
3. Start walking for a second and then sneak( or block)
4. Notice that resulting speeds from step 3 and step 4 are different
5. It shouldn't because after all the actions are done, player's state is same(other than motion)

Demonstration Video

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Note:
It seems that blocking in lava have little or no visible effect described in this ticket.