For some reason I had the iron talisman that gives +3 movement marked as obsolete in one of my games, even though there was nothing that replaced it or even came close to replicating its functionality. I noticed that when I was designing a new unit btw not when upgrading an existing one.

Bug iron talisman that givesd +3 movement marked as obsolete.zip

I'm pretty sure I might have this too - I remember not having a 3rd tier iron movement bonus the other day, and it surprised me.