This is not a bug, more of a...realism thing? Representation quibble, I guess? It's specifically about Dowager Countess Yvette and her wheelchair use.
She's in a manual chair (I mean, I assume), but we never really see any mentions of her having a nurse or an attendant (isle native or otherwise) to help push her - she can navigate on her own to a certain extent, but she's an elderly woman with limited reserves of energy and she also has to, presumably, navigate stairs as well as less forgiving surfaces like the fields outside the castle. They don't need a sprite or anything, but a mention of some kind of support worker character accompanying Yvette would probably be appreciated by a lot of players.