The vscode (Visual Studio Code) (not updated itself) interface now uses a monospaced font.
Seems like there’s a regression in fontconfig 2.18.1.
Fixed it with manjaro-downgrade fontconfig and selecting fontconfig 2.17.1.
It seems already fixed in fontconfig, but waiting for a new release.
@Yochanan I did first empty user and system .cache/fontconfig and reboot, but it didn’t fix it.