Hi Xyth,
Not sure if this has been reported already or if it's working as intended, but after updating to 1.20 I cannot give any promotions to my Battering Rams even though they have the XP. I can upload a save later if you need it.
Will investigate.
The Mausoleum of Maussollos is again useless for short golden age?
It should apply to short golden ages as well, if it isn't that's a bug.