Hello @simonboland
I experience the same issue right now, I’m using dunfell (commit f5864bfb32906b87cc24d5b84e74805994f0ef3e 25th of January 2021) and I have quite the same configuration.
Have you found a solution ? Or are yu stil on Zeus ? Seems the issue you reference above (MEN-3834) do not help here.
Dunfell is LTS so my preference at this time. If any body has a similar issue (just notice also Mender integration of STM32MP157C on dunfell - #2 by mirzak which is very similar, maybe identical issue).
Regards,
Joel