The bug

Mobs summoned with no health (Health:0f) will not drop any loot.

I expected that mobs summoned this way drop loot.

Steps to reproduce

Summon a mob with Health:0f in their NBT tag

/summon zombie ~ ~ ~ {Health:0f}

For comparison summoning a mob with health then killing it will drop loot

/summon zombie ~ ~ ~ {Health:1f}