Problem: Gilded Vault does not provide 2 GW slots from Great Merchant Giovanni De Medici. How to reproduce:  Open save file.  Check GW, to see Grand Bazaar in Biruta has 2 GW slots and 1 Writing because it was built by Giovanni.  Join Owls of Minerva and promote its governor again so that Gilded Vault is available.  Check GW again, to see both slot and work disappeared.