Item summond in a chest with /setblock disappear when manualy trying to add it to the same Item

Item summond in a chest with /setblock disappear when manualy trying to add it to the same Item

The Item I summond in the Chest should add up with the same item in the inventory when i manualy want to add it up

The summond Item simply disappeard, but the number of the existing Item didn't go up

1. Summon a Chest with an Item(eg. Apple) with the /Setblock command.
2. Add the summond Item to an existing Item in your inventory of the same ID