Copper Golem won't drop holded item when death

Description:

Copper golem won’t drop item it is holding when it is killed by player

Steps to reproduce

1 - Place 2 Chest filled with 2 different type of item respectively (e.g. Diamonds and Raw Iron Ingots)
2 - Summon a Copper Golem with 1 Copper Block and 1 Carved Pumpkin; Put another type of item in the copper chest (e.g. Carved Pumpkin)
3 - Kill the Copper Golem

Expected results
Copper Golem will drop its normal loot and item it was holding

Observed results
Copper Golem dropped normal loot , but not the item holding