When creating hierarchies, it's possible to rename the items in the hierarchy. Once you have done that, you can't see what the original column name was (unless you are using external tools like Tabular Editor).

This is almost to be treated as a bug, but since it's probably "by design" I log it directly as an idea.

The suggestion here is to show the original name as a tooltip, the very same way as renamed columns are shown as a tooltip for visuals
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