Empty fields get spaces when exporting XLSX! in PB2019 not in PB2017

There are also no spaces when exporting Excel8!

Create an external datastore d_testemptyxlsx with 1 string field

datastore lds_test
Long ll_row

lds_test = CREATE datastore
lds_test.dataobject = 'd_testemptyxlsx'
ll_row = lds_test.insertrow( 0 )

lds_test.SaveAs( "C:\Temp\testxlsx.xlsx" , XLSX!, FALSE )
lds_test.SaveAs( "C:\Temp\testexcel8.xls" , Excel8!, FALSE )

DESTROY lds_test

(Copy/Past field A1 into a text editor)

In Excel the XLSX file testxlsx.xlsx field A1 will be "    "

In the XLS file testexcel8.xls field A1 will be ""

In PB2017 field A1 is "" in both Excel8 and XLSX

This is blocking our applications from being converted to PB2019