I have a blueprint interface reference that seem to be sticking to everything that once implemented it. I went through all the blueprints that implemented, ctrl+f, and removed every mention of the interface from the blueprints so I can cleanly delete it. Nothing seems to be working and references are just not going away. When I get to the Delete Assests window, how do I force a replacement with None? That’s what I really need!
I would really like to know how that is done, too.
Try Force delete and then restart the engine and see if it still exist . and also try fix redirect things on the folder of the blueprint and see.
and anyway, you will have no issue with that as long as no active bp that uses the deleted one.
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I was able to fix the issue of having a missing reference just by simply saving the asset. I didn’t change anything with the asset, I just right clicked the asset and selected save. When I reopened the project the next time I no longer had the warning of a missing reference. Hope this helps!!
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This! Thank you! It worked! 
This is a real workable and simplest solution for this kind of issue. Love it!
I created again the referenced asset, then I searched on dependent Blueprint asset, found nothing, finally I created a variable of that referenced asset on dependent Blueprint, deleted it and… it is done with reference. I deleted the “no-more-referenced” asset. Now it’s clean.