Hello!
I created a simple code with example WMS Layer on the Scene View with the ground elevation.
Codepen: https://codepen.io/tomaszbarczyk/pen/VwYQRVN?editors=1000
I observed that at certain map tilt WMS Layer is not covering the whole visible area whereas it should. Actually WMS layer should cover terrain selected on this screenshot:

Is there any option to fix that behaviour? Any changes in layer configuration are needed?
Regards,
Tomek