I’m unable to complete the HRE Mastery “Fleet of Foot”. It seems that a recent update which made a change to Marching Drills, moving it to a civilization bonus and no longer researched, may have broken this related mastery challenge which requires researching the Marching Drills tech and building 30 infantry before reaching the imperial age.
Am I missing something or is this an oversight/bug? How can I complete this mastery challenge currently?