Hi @gchirico Welcome to the community, we are happy to see you here!
We are aware of that little issue and our team will work on it as soon as we are done with some things that have a bit higher priority than that!
When it comes to your problem, I have a workaround solution, basically all you would have to do is switch to a table view in the folder where that reference attribute is created and hover over the items that are linked, each item will have a small X sign on it in the table view and you’ll be able to click on it in order to remove the referenced item!
Here’s a little video that explains it all, please watch it till the end:
I hope that video explains it all!