how to create custom disks that will drop out of creeper

Greetings i know this is a Year but have you found a solution for this problem.. 
Since version 20244 the discs are under the item category and you can check the "is music disc" and in creative you can 
give you the disc, but my creepers wont drop them... i killed almost 100 creepers with skeletons but only the vanilla discs drops. PLS help me ;( 

Greetings i know this is a Year but have you found a solution for this problem.. 
Since version 20244 the discs are under the item category and you can check the "is music disc" and in creative you can 
give you the disc, but my creepers wont drop them... i killed almost 100 creepers with skeletons but only the vanilla discs drops. PLS help me ;( 

EDIT: I found the soultion. When You have all your discs in your Workspace then you can go on the leftside to the Tab "Element Tags" there is a TagType "Items" with TagNamespace "minecraft" and the TagName "music_discs"... Delete this and create a new one with the TagType "Items" the TagNamespace "minecraft" and the TagName "creeper_drop_music_discs" and add all your and the vanilla discs to this tag.. Now Creeper DROPs all the discs when a Skeleton kills the Creeper. I hope i could help someone with this.