Version: 1.0.0.216
I have observed this behavior in the two games of R&F that I've played, both as the Koreans. After I have researched stirrups so that I could produce knights, I was still able to produce heavy chariots. This happened for a long time. Eventually, the ability to produce heavy chariots disappeared, though I am unable to document exactly when. This is contrary to the behavior that I've come to expect of Civ6. In the case of every other unit, obsolete units can no longer be produced, once an upgrade is available..
I have observed this behavior in the two games of R&F that I've played, both as the Koreans. After I have researched stirrups so that I could produce knights, I was still able to produce heavy chariots. This happened for a long time. Eventually, the ability to produce heavy chariots disappeared, though I am unable to document exactly when. This is contrary to the behavior that I've come to expect of Civ6. In the case of every other unit, obsolete units can no longer be produced, once an upgrade is available..
