Idk if this had been like that and I only noticed now, or if this is a regression. Icons on buttons with icon and text change their color slightly later then the text. It’s pretty visible when you have a strong hover contrast:
But it seems to happen all the time, e.g. here on meta:
I also noticed this. Buttons’ background and text color don’t have a transition attribute, whereas icons have (which targets color, to add extra details), hence the delay.
We already have transitions on most buttons, so this gets us back to consistency. We’ve always had transitions on buttons so removing them would be a bigger change.