Hi Matt,
This is the shortcode of the popup frame of the ribbon shortcode in the TinyMCE editor:
https://pastebin.com/281EJi8D
However, just to make sure, I created a test shortcode with one select attribute and for some reason, that one works. Here is the code for the working one:
https://pastebin.com/jnaswh5y
I suspected that it might have to do something with the old one, so I tried removing it and importing it again, no effect. Also, I removed it completely then created it again with the exact same options/attributes, still no change.
Kind regards,
tastingtheweb_