Preformatted text in wiki HTML export rendered on one line

How to reproduce

• Create wiki page with preformatted text with multiple lines (preformatted: add a space before the line)
• Download as offline-CP module
• Open downloaded module and look at wiki page
  => the multi line preformatted text appears on one looooooong line

Offline preformatted text should render as within OpenOLAT

As example, use admin wiki from community server.