Question about Curve Panel UI

The panel in Photoshop is a completely different action. It is a curves adjustment layer. That one works completely differently from the curves in Lightroom/camera raw. I would not expect them to behave the same exactly. However, in this case, it looks like something went wrong in Lightroom, because if you simply dragged the white point down in both examples, you also should see a knee in Lightroom just like what you see in Photoshop. When I try the same, it works correctly. What version of Lightroom are you working in?