They retain the passive, not the active of their former race.
No, the demonstration showed they still retain the active.
Fane had Encourage.
Actually, if you check again the Undead reveal stream, they start with an Undead lizard, his active is play dead, he doesn't have the lizard active.
Don't forget that icon don't get removed as you lose memory of change form. So you would get the icon of encourage even when switching to something else, even if you can't use it anymore.
So I still think you only get one active.
