@properlypurple – you are a lifesaver! This did the trick, thank you so much! I was ripping my hair trying to fix this on my site.
Wonder if there’s detailed documentation that lists where all the controls for theme customisation are for Twenty Twenty Four?
I might be wrong, but it seems like I can tweak some elements like colours right where I see them in the editor, while others pull from Styles – and I can’t be sure which is which.