What you were expecting to happen, and what actually happened:
The journey and holiday event both restrict your choices to using troops/weapons of one color. However it is no longer possible to filter troops or weapons by only that color when using All Colors. (Using the X on all other colors might be a workaround.)
This does not happen if the colors are unrestricted.
How often does this happen? When did it begin happening?
I never saw this before 7.2.
Also I’m still missing artwork for a bunch of troops.
Let me see if I’m understanding this correctly … there’s a single-Color restriction in place and you want to see Troops/Weapons that are solely that Color (e.g. Guild Guardians, Common Troops, Class Mythic Weapons or Ultra/lower tier Weapons) ?
If so then this is not new at all, it has always happened in color-restricted modes (World Events, Tower of Doom, Faction Delves, etc) to some degree. Especially in Delves…