Internal Compiler error on accessing a method of a return of a property that has a twin

Ok the title is a bit insane, but basically I'm getting an internal compiler error when i have 2 properties with the same name and return type (must be a class - valuet types dont cause this error). Attempting to call a method on the return of this property causes a "Specified cast is not valid" internal error.

code:

class Foo:
static _bar=Foo()
coo=5

static Bar:
get:
return _bar

static Bar:
get:
return _bar

print Foo.Bar.coo