I have just notcied that after updating From 12.19 to 12.20
Export browse does not have any data in the result file. Only Browse Heading data is exported.
Not sure if this is anything to do with it in the 12.20 update
Change: Browse, ThisView changed to &View (pointing to View:Primary). Opens the door to multiple view structures per browse.
After going back to 12.19 export works great as expected.