I noticed this last week (or two weeks ago) and encountered it again today.
For EnumList, we have the ability to set it with a Base Type of “Ref” in order to pull list items from another table. However, the box named Base Type Details which allows the setting of the Reference table does not show UNTIL the editor Save action has been performed.
Done has been clicked and column re-entered for Editing - still cannot set table
Only after clicking Save in the editor does the Base Type Details box appear