Michael Sweet was not able to reproduce this bug with the Canon printer he got at Apple. See
https://github.com/apple/cups/issues/5512
Please post in this bug report to directly interact with Michael.
Before doing so, get a setup of Disco (upcoming Ubuntu 19.04) and check whether your problem still exists. Disco contains all the fixes mentioned in the upstream bug reports.
Michael Sweet was not able to reproduce this bug with the Canon printer he got at Apple. See
https:/ /github. com/apple/ cups/issues/ 5512
Please post in this bug report to directly interact with Michael.
Before doing so, get a setup of Disco (upcoming Ubuntu 19.04) and check whether your problem still exists. Disco contains all the fixes mentioned in the upstream bug reports.