According to the changelog of version 5.0.0.99.1 (/usr/share/doc/cupsys-driver-gutenprint/changelog.gz) the support for the named Canon printers is under development, and there are known issues with these printers. Please check with the mailing list (<email address hidden>) if you have any questions.
This looks like an upstream gutenprint issue, it would be nice if somebody could forward this issue upstream to the gimp-print-devel mailinglist.
According to the changelog of version 5.0.0.99.1 (/usr/share/ doc/cupsys- driver- gutenprint/ changelog. gz) the support for the named Canon printers is under development, and there are known issues with these printers. Please check with the mailing list (<email address hidden>) if you have any questions.
This looks like an upstream gutenprint issue, it would be nice if somebody could forward this issue upstream to the gimp-print-devel mailinglist.