I didn't realise that Meghan was mixed race until I saw her mother at her wedding.
But I didn't follow the press, I was abroad for a while (glorious pre-Covid times) and was surprised to see the announcement of the Royal Wedding, which I watched.
I initially didn't register Meghan to be a woman of colour or mixed race, it became clear to me when I saw her mother, the gospel choir etc. But I might be a bit naive, my focus wasn't on it (as in: I don't scan people and analyse their skin colour).
But prior to the wedding Meghan didn't strike me as mixed race or a woman of colour also because she didn't seem to adopt the traditions, I think. Eg she never had a traditional hair style, dress sense and culturally seemed to associate with trendy food, trendy life style locations etc Maybe to me the cultural belonging is more important than the colour of the skin or the parent's skin.
What about adopted children? I have a friend from Korea that has been adopted by white English parents. To me she was always English, despite her somewhat exotic look. But she hadn't even visited Korea, she spoke English and grew up in England.
Sorry, this is OT I guess