Online manual reader rendering issues

[eigengrau]

When using the online manual browser in SWI-Prolog 7.4.2, I’m seeing odd rendering issues in headlines, code blocks, underlined words, crossreferences and literature references.

When I copy-paste text portions containing the block glyphs, they are pasted as the control character backspace. Any pointers?

Kind regards!

[JanWielemaker]

AFAIK fine on 7.6.0-rc2. At least it works here (Linux).

[xyproto]

I'm able to reproduce this issue. After launching help., the text contains ?? in several locations:

This is for the official Arch Linux package, that is built with the following instructions: PKGBUILD.