Thrown items do not copy item data to the entity if it's the last item in the stack

Using the following item in survival mode:

/give @s minecraft:snowball{custom:true} 2

Command to verify data:

/data get entity @e[type=minecraft:snowball,limit=1] Item

When there's more than 1 item left in the stack, /data will show the item's data. If the snowball thrown was the last item in the stack, the Item will be nonexistent.