When I add an item to a collection from a data connector vs extension editor, it appears different in the Data Tools UI. model_definitions were created in the extension editor and does not have a paper icon next to it. The other collections were created in my data connector and they have a paper icon next to them. What does the paper icon mean?

Perhaps on a related note, but, when I add an model_definitions item with the exact same primary key, I am getting duplicates of that item. Despite my best efforts (so far), I am unable to “update” an existing collection item when using the extension editor.
Items added to collections from my data connector do not create duplicates.
Thanks,
Dan