Upgrade is not applying to “All ranged non gunpowder units”
Springalds are listed as ‘ranged’ and the buff is not applying.
In addition to that, it doesn’t apply to buildings (the description says it does) and gives +1 range to Crossbowmen.
Thanks @TopColc and @Turnspender. We are aware of some issues and are looking at Incendiary Arrows. Appreciate the reports!