When ender pearling and taking damage from a mob at the same time, you get 2 extra hearts. This method, when at full health again with the glitched hearts, makes it so Zombies kill you in 12 hits, rather than 10 on easy mode. It is very easy to reproduce.
Thank you for your report!
We're actually already tracking this issue at MCPE-56836, so I will resolve and link this ticket as a duplicate.
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