I am playing with the Romani and triggered the Polybian Reforms in year 242 BCE. After a few turns the appropriate "resource" appeared in all homeland cities.
Problem is, I can build Polybian units only in those MICs I built (or upgraded) after the reform was triggered. Is this normal?

I currently have a 4th level factional MIC (built before the reform) in Roma producing Camillan untis; I assume it would convert to Polybian if I upgraded it to 5th level. But then what would it happen when I eventually triggered the Marian reforms?

Did I miss something?
Thanks for any help!