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This has now been fixed in 1.16, which is releasing soon. Currently struggling with 5.1 changes :)
It looks like you're missing the light attenuation node. You should check out the custom lighting tutorial and/or preset that came in 1.14
This is, unfortunately, the expected behavior, there's no way to properly not-write to the zbuffer and get proper shadow information
Disable lighting in the lighting settings
Look in the build log to see if you find any errors there

Go to experimental settings and force Shader Model 2.0. Also, are you getting any errors on build?
That's probably because you're on Windows, which defaults to DirectX. It will still work on OpenGL platforms, so, enable both!
Let me know if it happens there :)
5.0.0f4 is the earliest supported version
Dit it happen as soon as the interface opened? And which Unity version are you on?