When I copy text within Acrobat the spaces are absent.
I just used Calibre to export to TXT and RTF. The former only produces the document outline (but none of the document proper), which lacks the extra spaces. The latter produces the image layer, not the text.
I have posted my quandary on the Kindle forum (
https://www.mobileread.com/forums/sh...d.php?t=310958), hoping that someone over there has had the same issue.