Umbral Choir Gameplay Affinity icon doesn't show up on specific techs, instead showing the icon for the visual affinity. This is a result of making an empire / star system improvement unlockable via path prerequisites without making a new technology for it. 

Expected result:

Affected Techs:

Update:

This also affects other factions

Nakalim:

Hissho:

Vaulters:
Cravers:

Lumeris: Vodyani:

United Empire:

Horatio: 

Unfallen:Riftborn: