TIL
Icons with/no text means that any text that would normally be in the column will not show.
Took me a bit to figure out why my dates added column wasn't showing the dates for books that had their data embedded in them as shown by the icon in the date added column of the "green padlock".
I am surprised it took me all this time for such a conflict to be shown. I am sure that somewhere in the past I had accidentally created a rule with no text in a text column.
