That was an old bug with ! _OneView since Rhino 6 that I reported a few years ago, but I thought that it have been already resolved. Today, I needed to use ! _OneView in Rhino 7 and noticed that the bug is still present. It basically refuses to update while the camera is being controlled via 3d mouse. Most likely the update of the view-dependent CPlane relies on detecting RMB click while the mouse is being moved, because only then the CPlane updates properly. Rotating the camera via the 3d mouse, followed by panning the view with the MMB (the middle button inside the mouse scroll wheel) will not update the CPlane.
That’s so annoying!
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