Print: FLATVIEW=grouped only indent with AS=txt

This behaviour is intended or is an error able to fix? Because in the help file there's no explanation about that FLATVIEW=grouped only indent is AS=txt is used.

It's intentional. Indentation wouldn't normally be what you would want when using CSV or tab-separated data for import into a spreadsheet. (Using one of the columns which includes the path would normally be what you would want in a spreadsheet.)