I don't know if it is just me, but Guix QA recently seems to always show build status unknown when what really happens was the build succeeds on both x86-64 and aarch64 but on other platforms it was in "scheduled" state but the scheduled build never actually got run. In any case thanks to the reviewers/committers some of my patches got reviewed and committed in this state.
It is just the build status is misleading. If just x86-64 and aarch64 builds are used to determine if a patch builds successfully then the badge should reflect such.