Changing one custom object's setting applied all of them. How can i set one object at a time?

Development Programming & Scripting Blueprint
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You’re using class defaults- both setting and getting.
Also it looks like you’re using the wrong texture for each thing. The before cooking meat is cooked and the after cooking meat is raw.

Rather than doing
Slot 1 (ST Item) → Item Class → Defaults → Food Detail → Set

Do
Slot 1 (ST Item) → Food Detail → Set.

Change it in the same way in the get script- don’t get defaults.