Small upgrade bug in 3rd Intro (Locked Alliances)

[Mercade]

Description: In the 3rd Conquest Intro (Locked Alliances) the Musketman is present for building (by Germany, maybe others too) and upgrades to Rifleman. The Pikeman also upgrades to Rifleman. In my view, the chain should be Pikeman -> Musketman -> Rifleman
Steps to reproduce / Expected effect / Observed effect: Obviously, upgrade from Pikeman to Musketman should be available.

This is tested with 1.00 / 1.02, but I assume it hasn't been changed in 1.12beta.