Why is my replacement AirPod Pro not getting recognized and showing a green light instead of amber?

Bought a replacement left AirPod Pro usb c as other one fell down a bloody drain. Came today I followed the connect steps but the new left AirPod doesn’t seem to get recognised.

New AirPod was placed in fully charged case for 30min.

Lid of case was opened and instead of flashing amber like it says it should it just shows a green light. I’ve tried following the usual steps despite this like forgetting the device, holding the back button and reconnecting it and it does seem to work. I suspect it has something to do with it not showing amber when the lid is opening after forgetting it.

I would like to know a fix as I paid £86 for this and bought directly from apple.