Viewport aspect ratio is likely unrelated.

Those warnings mean your GPU driver doesn't support a feature that's critical for shaders used there. Sorry for that :(

Which GPU do you have?

The last time I encountered a similar issue was on my old Thinkpad with ancient ATI 3650 Mobility Radeon GPU (on Windows but only when running OpenGL rendering backend, DirectX ANGLE backend was ok, so it wasn't really hardware issue, just drivers).

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BTW to see how it looks when it works properly, here are video captures:

https://www.youtube.com/playlist?list=PLwLlCBbP0Cc57IQLBH_8j...