data modify doesn't append values to Items list of Inventories

The Bug:

When trying to append a NBT tag to the Items list of an Inventory, the NBT tag doesn't get appended and instead replaces the first element of the list

Command I used:

/data modify block ~ ~-0.5 ~ Items append value {id:"minecraft:apple",Count:13b}

How to reproduce:

-Stand ontop of inventory(chest,dropper,dispenser)
-Execute Command multiple times