Still evaluating KOReader on my Linux box in preparation for using it on my Kobo, and ran into this interesting problem with the rendering on an ePub of a technical journal. For reference, the journal can be downloaded here:
https://accu.org/journals/overload/overload156
Anyhow, I've noticed that monospaced fonts are not shown as monospace (which I've confirmed are displayed as monospace in Calibre's ebook-viewer, and that the css specifies monospace using the highlight & show HTML/CSS feature). I also noticed that some of the overlayed text/images are not rendered correctly.
Is this a known bug, or should I submit a report on gitlab?