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Image still attached to post even after removing it as featured image

I’m sorry if this is too noob of a question, but when I upload an image and set it as the featured image then later remove it (as featured image), the media list still shows it’s “Attached to” the post I removed it as featured image from. Any clue?

More importantly, how do I then make it so that when I remove the featured image, it will be “Unattached”? Any hook I can attach to or the like?

Thanks so much.