I'm riding a horse and am under a block 4 blocks above me and am taking damage. Also, the bubbles displayin how much air I have left when underwater display. I haven't seen this posted yet. And this is MCPE 1.1 BETA. Screenshot attached
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Please note that the suffocation bubbles appearing has been marked as working as intended (MCPE-17879).
Confirmed - the hitbox is incorrect whilst riding a horse. If you ride under a 2 high gap you take no damage, but if the gap is 5 high, then you receive suffocation damage.
Added screenshot.