Make the game remember "hidden" transformations for all ruler types...
... so that their "hidden-ness" (the state of the transformation visuals not appearing) remains in future game sessions (including those played by the AI).
For example, I play as a dragon/giant/eldritch/vampire ruler and during my last game session with that ruler that resulted in its (re-)ascension I transformed my main race into wights and deactivated the visuals of that transformation. As the game currently works, in the next game session featuring this ruler (played by myself or the AI) the hidding of the wight transformation should not be recalled by the game (like it does for champion and wizard rulers – to whom racial transformations personally apply) and therefore when the wight transformation gets applied in that new session the visuals of that transformation stand visible. And so what I'm proposing here is to get the game to remember the hidden-ness of the wight transformation for ALL ruler types, so that in future game sessions with the ruler the visuals of the wight transformation are deactivated by default. Ensuring that the vision the player had for the race persists even when that race is played by the AI.