"Item Received" notification string cannot be edited

I’m trying to replace the text that appears when a player receives an item, but changing it in strings_en.yaml does nothing.

What it’s set to in the .yaml

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vs what’s being output.

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Also, the original text in the .yaml is “Item added to inventory” so it appears this “Received item” string is somewhere that’s not accessible. I’ve looked just about everywhere and can’t find anything else that would change this text.