Export Contacts from Search Builder w/ Field Mapping, mapped field columns not exported

Apologies:  as a newbie, I may be violating some rule.  But, here goes. (UPDATE: sorry, newbie did screw up, found instructions.  Removing this until I post it on the boards.)

Note that I am attaching a document with screen shots.  Our website is running 4.7.25.  Also, I was able to replicate this over on this demo site, which is running at version 4.7.28, as well: http://dmaster.demo.civicrm.org/civicrm (I saved a field map named vtmosaic_map_01, in fact).

1. Selected Search Builder
2. Set extensive search criteria
3. Set Select Records: to 'all'
4. Select Export Contacts Action
5. Search Builder Export Options (Step 2 of 3):
6. Select Fields to Export checked
7. Used Saved Field Mapping (note that I get the same problem regardless of my choice here)
8. All other left at their default
9. Clicked Continue
10. Select Fields to Export (Step 3 of 3)
11. Left at defaults 
12. Clicked Export
13. Opened resulting downloaded csv.
14. Columns were NOT as mapped; they seemed to be the fields shown on the search results, rather than what I had in field map.