`Methods from Deref<Target=[T]>` doesnt appear for type aliases

I have a type alias for a type that implements Deref<Target=[T], but Rustdoc doesnt generate the corresponding section in the sidebar like it does for the concrete type I'm aliasing

#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub struct Col<T: Copy, const N: usize> {
    data: [T; N],
}

pub type Mat<T, const H: usize, const W: usize> = Col<Col<T, W>, H>;

// snip

impl<T: Copy, const N: usize> Deref for Col<T, N> {
    type Target = [T];

    fn deref(&self) -> &Self::Target {
        &self.data
    }
}

rustdoc 1.82.0 (f6e511eec 2024-10-15) on macOS 15.2

Start with the Rust reproducer in the issue and generate rustdoc for the concrete type and its type alias, comparing the sidebar sections. Trace how rustdoc handles methods from Deref for each form. Done means the alias documents the corresponding Deref methods consistently with the concrete type.