dont quote me on this but i believe its a feature
i can confirm, this happened to me too
i can confirm
This is because while you're still on the loading screen, your character has already been placed in the world, and can take damage and die before you even can control it
It would be nice of mojang to release a hotfix for this soon rather than waiting for 1.11. This bug makes the game extremely unplayable, especially on mobile, and handling more than 2 shulker boxes at a time will SERIOUSLY lag when opening your inventory. I'm talking about a good 8 second lag spike. On a sidenote, dropping items from within the inventory screen also has gotten much laggier and consequentially slower