Inconsistent error messages with circular base type argument

I noticed here that a type argument to a base class can reference property types in the same class, so I wondered what would happen if I tried to reference an inherited property type that itself depends on the type argument. To its credit, the compiler didn't crash, but the errors I got didn't make much sense.

TypeScript Version: master (e1a4c2779f93c8389d1589e543920a61771e97ec)

Search Terms: circular self referential base extends type argument property same class lookup type

Code

class Super<T> {
  foo!: T;
}
class Sub extends Super<Sub["bar"]> {
  bar!: Sub["foo"];  // Actual: Error: "Property 'foo' does not exist on type 'Sub'."
  baz!: Sub["foo"];  // Actual: No error
}

Expected behavior: An error that indicates that circular type annotations are involved.

Actual behavior: As marked.

Playground Link: link

Related Issues: None found, but this is hard to search for.

Reproduce la discrepancia usando el Playground Link proporcionado con la revisión master de TypeScript mostrada en el informe y, a continuación, rastrea el comportamiento del compilador para el argumento de tipo base circular. Se considera completado cuando los casos bar y baz reciben un diagnóstico coherente que indique que hay anotaciones de tipo circulares implicadas, en lugar de los resultados actuales, que no coinciden.