Why doesn't it display (code) in books (epub) on macOS?

Question

Electronic books

Hello, I ran into such a problem, I read a book on iOS, everything is fine, I open it on macOS and the text (code) examples are displayed there. Installed another editor - the same thing.
Right here. there should be text (code example) but on poppy it is not displayed (

In the phone everything opens as it should. I
also did the conversion via https://convertio.co/ . and everything is cool - the code displays (((
Link to the book

Answer 1

it is quite possible that this is not the original epub, but an automatic envelope from another format. in which something went wrong (for example, the required font is missing).
you would share the book, it would be possible to have a closer look.