Buggy Armor Health Boost
I created a helmet with custom nbt to give the user +80 max health, but when I tried it in survival mode. After a second the new hearts disappeared, so to test whether the bug was just visual I gave myself poison 1 for 1 second. That should have only given me one damage, but instead I died and when I respawned, I looked like this (see attached screenshot) and I was not dead or dying, and I still had only one row of hearts.
Environment
Windows 8.1, 64 bit java
Linked Issues
Created Issue:
Buggy Armor Health Boost
I created a helmet with custom nbt to give the user +80 max health, but when I tried it in survival mode. After a second the new hearts disappeared, so to test whether the bug was just visual I gave myself poison 1 for 1 second. That should have only given me one damage, but instead I died and when I respawned, I looked like this (see attached screenshot) and I was not dead or dying, and I still had only one row of hearts.
Environment
Windows 8.1, 64 bit java
duplicates

Here is the command I used:
{AttributeName:"generic.maxHealth",Name:"generic.maxHealth",Amount:80,Operation:0,UUIDLeast:3457,UUIDMost:852671}give @p diamond_helmet 1 0 {AttributeModifiers:[
]}
Duplicate of
MC-19690I do not believe it is a duplicate, since the other post says the item was removed from your hand, and the helmet I used was never in my hand, just in my armor slot. It also says the death is due to the instant health effect, and, while I did use instant health to fill up the new hearts, the pseudo-death occurred when I gave myself poison.