This issue may not be related to LibreOffice in particular but only to the type 1 font "Nimbus Roman No9 L" that I often use as a standard replacement for "Times". Anyhow, maybe someone can help to resolve this issue:
Whenever I export a text document, that uses the font "Nimbus Roman No9 L", with LO Writer via "File -> Export as pdf ...", in the resulting pdf file any blank that separates subsequent words from each other is removed.
When I print into a PostScript file instead and afterwards convert that file via ps2pdf (ghostscript 9.06) into a pdf file, the blanks are correctly displayed.
Interestingly, I have not observed this effect for other fonts (see example attached). Finally, I 'd like to add that I already noticed this issue under LO 18.104.22.168.
Maybe you can help me to resolve it?
Created attachment 104688 [details]
Resulting pdf file
... and the resulting pdf file.
Created attachment 104689 [details]
Original LO Writer document
Could not embed the fonts because of the size limitation.
Caused by local font installation