[MCPE-182594] HP is stuck at 19 and doesn't regenerate to full amount

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I was playing survival, my hunger bar was full, but the HP bar says that I have 9 and 1/2 hearts. Supposably, it should be 10.

Steps to reproduce:

Create world with the difficulty set to Hard
Take damage from mob (drowned or some others) until health is below maximum.
Wait for your health to start regenerating, eat food if necessary to keep regenerating health

Observed result:
Your health regenerates until 19 HP (9 1/2 hearts).

Expected result:
Your health regenerates fully.

Video: https://1drv.ms/v/c/da3e81914c125759/EdhqcZsTu8tNnjCt8WHju-gBG5GqWusvPpd3kPSlAsqxjw?e=VU2FCt