Played mongols, high resources starting Age 2, reached Age 4 building the khanate palace, researched no tech, free lancers came out of the building, they came out as Tier 2 units, built stables, researched age up lancers, free lancers stayed as Tier 2 units, built a lancer from stables, came out as Tier 3, researched age up lancers again, lancer that was built from stables became Tier 4, free lancers stayed Tier 2.
Khanate Building T4, Free Lancers do not age up with Mongols lancers
Thanks @ValleyedGoose33! I’ve logged this so the team can check it out. Appreciate it!