XPS 9320, Windows 11, charger warning after switching from passthrough to direct charge

System: XPS 9320, Windows 11.

I usually use my Anker PowerExpand 8 in 1 with the original charger connected to it, and the laptop shows a warning sign that charging is slow.

I don't mind the above, as the Anker device might be taking some power for itself.

The problem is that in order to get back the fast charging, and for the warning sign to disappear, I need to reboot. Just removing the Anker device and connecting the charger directly won't work.

Is this normal?