[Bug Report] unOwn, unOwn, and Own

Minecraft Username:
@StanleyMines

Brief Description:
1. Player is unable to unOwn items after a name change;
2. unOwn goes by username attached, not player uuid.
3. Upon death, username isnt cleared from owned item.

Instructions:
1. name change, then try /own remove (Item ID)
2. ^
3. die with /owned items. May be because of tombstone; even dieing where a tombstone cant be placed, name and player uuid stay.

How many times did you recreate this bug?:
1. every time I try (8items*3tries)
2. 3 (^)
3. 2 (dieing in tripwire; drowning)

Result:
1. still owned by old name
2. unOwn goes by name, not uuid.
3. item unaffected

Expected Result:
1. item to be unowned
2. item goes by player's uuid, not name
3. name (maybe uuid) get unattached to item

Evidence:
@ClarinetPhoenix @emongolab were there when I tried to unown the items
Item I9C2K9XJ; changed over to my name by @ClarinetPhoenix.

 

Once the items were put in the tombstone, I realized that they probably would require the items to be droped to loose the attached name. Afterwards i tried falling and drowning. Both gave the items back on the ground, with name and my player uuid still attached. I then pm'd Clar. She changed the item's ownership to me.

Sorry i didnt post earlyer, fourms seemed down for me last night.