A fresh instance shows a combination of standard and custom columns in a specific order followed by all 16 extra columns (in ascending order) in the context menu when right clicking on the column header e.g. in list view.
How to restore
this layout in an upgraded instance where there is a wild mix of standard properties, a few cc's, the first 5 extra columns, again, a few cc's, the next 11 extra columns, ...
Resetting the ccs to factory default via Configuration... doesn't help
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