I am really sorry but can you please explain a bit better what is the issue here

So if I go to the Trees in advanced tools, and try to add multiple items using the En-mass via tag, it is not finding any of the articles that I have tagged. I have to add the articles one by one.

also running into this. Tagging with test for example

then attempting to add that to a content tree using the search results in

I also see this issue in the https://www.worldanvil.com/learn/bbcode-tutorials/tagged-lists tagged lists section here. With

shows