sorry, I only find saves from ~950 AD, this was around 1200, maybe it had something to do with the Mughals&Mongols, I collapsed shortly after that (and I only had my capitol after agreeing to the flip) and in 950 the mechanic still seems to work (gift all my cities away, raze one for first check, research a tech for 2nd check gives 0 on expansion)
I found a bug
I founded Hinduism with China and then built a temple, but I didn't found Buddhism. It is still before the Greek&Indian start but I can't find a date-limit for founding Buddhism.
I founded my capitol on the spot and beelined for Buddhism, so a pretty uneventful game so far. But why don't I get the religion?
edit: continued a little and the game gets interesting.
I switched to India on spawn and gave them hindu-missionaries in each city via the worldbuilder. this caused Delhi to repurpose a pagan temple as hindu temple -> nothing happens.
Then I built a hindu temple in my capitol: voila, buddhism (with the 3rd hindu temple in this world).
so there seems to be a bug limiting buddhism only to india or to only be founded after a certain date, both of which are not currently explained in the game.
edit2: this time I waited untill a few turns after the Indian spawn before completing the temple as China. Still no Buddhism. This is annoying
