RPITITs don't inherit outlives bounds after >1 layer of nesting

[compiler-errors]

I tried this code:

#![feature(return_position_impl_trait_in_trait)]

trait Foo {
    fn early<'a, T: 'a>(x: &'a T) -> impl Iterator<Item = impl Into<&'a T>>;

    fn late<'a, T>(x: &'a T) -> impl Iterator<Item = impl Into<&'a T>>;
}

I expected to see it compile.

Instead, this happened:

error[E0309]: the parameter type `T` may not live long enough
 --> src/lib.rs:4:64
  |
4 |     fn early<'a, T: 'a>(x: &'a T) -> impl Iterator<Item = impl Into<&'a T>>;
  |                                                                ^^^^^^^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
  |
help: consider adding an explicit lifetime bound...
  |
4 |     fn early<'a, T: 'a + 'a>(x: &'a T) -> impl Iterator<Item = impl Into<&'a T>>;
  |                        ++++

error[E0309]: the parameter type `T` may not live long enough
 --> src/lib.rs:6:59
  |
6 |     fn late<'a, T>(x: &'a T) -> impl Iterator<Item = impl Into<&'a T>>;
  |                                                           ^^^^^^^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
  |
help: consider adding an explicit lifetime bound...
  |
6 |     fn late<'a, T: 'a>(x: &'a T) -> impl Iterator<Item = impl Into<&'a T>>;
  |                  ++++

---

#112682 didn't install bidirectional outlives bounds 100% correctly when the lifetimes are being inherited past one layer of impl Trait.