icon colour reverted

I just updated Decode and my social icons have changed colour.
I checked the Customize tool and it is still set to “Use accent color instead of text color for icons”, but the text colour is showing, not accent colour.
I am using a Child theme, Customize page for Child theme. Things aren’t supposed to change when using a child theme, I thought….
Am I doing something wrong? It worked before updating.

EDIT: I went into Customize and unchecked the box, saved, then checked it again and saved again, but no effect.

On a side note, is there any way, via css or something else, to change the icon colour? If I wanted it to be a different colour than anything else, rather than be stuck with only accent or text colours? (I don’t really understand even how this works!)

Thanks!