Description: The Rapa Nui's emblematic unit has the unit family melee, so it upgrades from swordsmen to great swordsmen. So if I research heavy infantry technology before the military architecture the unit gets replaced already so I'm unable to build it. The other scenario is if I choose the Romans in the classical era their emblematic unit has the heavy melee unit family (same as the great swordsmen). So in that case the Praetorian Guards will instantly replace it before I even choose the Rapa Nui culture.

Steps to Reproduce:

1. Reach the medieval era and choose the Rapa Nui culture
2. Research the Heavy Infantry technology
3. Get at least one iron resource
4. Research the Military Architecture technology
5. The Rapa Nui's emblematic unit is not showing up in the city and it's already been replaced with the Great Swordsmen

Scenario no.2

1. Research  the Standing Army technology
2. Reach the medieval era as the Romans
3. Choose the Rapa Nui as the next culture
4. Get at least one iron resource
5. Research the Military Architecture technology
6. The Rapa Nui's emblematic unit is not showing up in the city and it's already been replaced with the Praetorian Guards

Expected Behavior: This unit should have a custom unit family or simply replace the Great Swordsmen as a heavy melee family member.