"oc adm upgrade --to-multi-arch" command have no guard in cases where there's cluster conditions that may interfere with the transition, such as:
Invalid=True, Failing=True, and Progressing=True

either apply the command while an upgrade is in progress, or while there's cluster conditions such as Invalid=True or Failing=True 

accepts the command

warns about the interfering condition, while allowing to progress only if --allow-upgrade-with-warnings is applied