I opened an epub file created exporting an odf file written with a recent version of LibreOffice (184.108.40.206). All the empty lines are rendered with a space encoded as $#160; inside a span tag inside a p tag. In Calibre and Sigil they are rendered correctly, in Okular they are not rendered and the text is less readable. I am not much worried about Okular, but I wonder if it is the only reader behaving in this way. I made some research on the internet and I know that in the past not all the readers supported it.
Strange enough, if I replace the lines with br tags it works in the readers I have available, but the linked article says that few ebook readers will support it.
What is the current situation with the most common readers?