Drop-chance is not being assigned to items with /cemd addhand

[RavioliSauce]

Information

Minecraft version: 1.21.1
Modloader: NeoForge
NeoForge version: 21.1.83
Environment: Singleplayer

Mod name: Configurable Extra Mob Drops
Mod version: 1.21.1-3.4

Description

Doing "/cemd addhand cow 0.5" with a potato in hand adds the following line to the mobdropconfig.txt file:
'minecraft:cow' : '{count:1,id:"minecraft:potato"}',
It doesn't add the dropchance tag to the drop item as it seems like it should, and on the death of the cow drops one potato on each death.