However, you’re icon selector UI looks like the old one. Take a look at the 3rd screenshot from my previous post—the title is “icons” as opposed to “select icon”, there is a dropdown to toggle between icon libraries, and then search. Based on these hints, it seems to me you’ve set up the new icon library, but are using the old icon element which is looking for the fontawesome icon font instead of your new lucide svg icon library.
I’ve been hit with this change as well, in my case with the “Select (Advanced)”, which uses the old icon format, and i cannot change it. As well as the “File Upload”, when you need to remove an uploaded file from the list.