[Bug]: In v8, DIM support broke for default implementations of inherited methods

[mkane91301]

Describe the bug 🐞

In v7, this worked:

public interface IFoo
{
    int Bar();
}

internal interface IInternalFoo : IFoo
{
    int IFoo.Bar() => InternalBar() + 1;

    [Get("/bar")]
    internal int InternalBar();
}

In v8, it complains that IFoo.Bar doesn't have a Refit attribute or the path isn't a string.

Step to reproduce

1. Copy the code.
2. Compile it.
3. See the warnings.
4. Try to run it in a unit test.
5. See the errors.

Reproduction repository

https://github.com/reactiveui/refit

Expected behavior

The behavior should not have changed between v7 and v8.

Screenshots 🖼️

No response

IDE

No response

Operating system

No response

Version

No response

Device

No response

Refit Version

8

Additional information ℹ️

No response