Should FaceID work when LCD opened?

I’ve purchased iPhone 11 with cracked display - FaceID not working - sometimes showing “not available” but many times just “move higher, lower - closer iPhone message” which I think confirms it is kid-of-working.

100% crack was on cameras and whe worse half crack opened on that “mirror” thing which is in my opinion that projector - but not sure.

I just wanted to know if I should be able to test FaceID when screen opened so no cracked glass on the way.

There is something mirror on that area on display where ‘Projector’ present.

I don’t want to spend £80 on display if FaceID not working :(

I’ve tried with opened screen to activate FaceID but no success as not easy to point directly on face what cannot see what is happening on display - but normally it should even start doing scanning.

Thank You

As I’ve learned from this video - “dot projector” is not cracked and “Flood illuminator” is fine - no signs of water damage

为什么维修iPhone后面容 ID会失效