The list of bugged 2-handed axe units is:
Varangian Guard
Tabardariyya
Berdiche Axemen
Dismounted English Knights
Dismounted Noble Knights
Dismounted Portuguese Knights
All Billmen units
Norse Axemen
Free Company Men at Arms
Galloglaich
Woodsmen
Croatian Axemen

And possibly:
Mutatawwi'a
Religious Fanatics