[1.7] Gapple absorption not always properly displayed

[Picajoluna]

Everyone on vanilla 1.7.10 -- map is Bastion.

1. Naked player gets hit by stone sword, after having eaten a gapple.
   The amount of damage dealt is correct (3.5 hearts), meaning the resulting health level is correctly displayed here (8.5 hearts left, factoring in the 2 golden absorption hearts).
   Yet the two golden absorption hearts are still there, when they should have disappeared:

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2. I've just gapped, and yet the golden hearts aren't shown. My health level is indeed 12 hearts though. Additionally, my tab is glitched, as in 1.7 Occasionally Filled Tab #26, whereas in case 1. above, it is not glitched.

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Sometimes the absorption hearts show, and get 'stuck' on the screen; sometimes they don't. Relogging changes the situation / puts me in the other case.

Regardless, the absorption effect is indeed there and players have the correct health level -- it's just displayed to them incorrectly.

Everything worked fine for me in 1.8.9. I assume this is a 1.7 only bug.