Removing attachment doesn’t actually detach it

Hello,

Love this plugin. I did notice however, that when I click “Remove” on an attachment, while it does remove it from the meta box on the post, it does not actually detach it from the post.

I know how to go into the Media Library and detach but would prefer my clients didn’t have to figure out how to do that.

I created a custom instance using the provided code in the GitHub. Is there something else I need to add to get the detaching to work?

Thank you!