Quoted from the official documentation title Compiled bindings:

Important
Compiled bindings are disabled for any binding expressions that define the Source property. This is because the Source property is always set using the x:Reference markup extension, which can’t be resolved at compile time.
In addition, compiled bindings are currently unsupported on multi-bindings.

I don’t understand why Source property is always set using x:Reference while we know that we can also use Source={StaticResource xyz}, for example. So in this case are compiled bindings disabled too?