Duplicate Deserialize impls found when deriving Deserialize for a generic type

[fjarri]

MRE (playground link):

use serde::{Deserialize, Deserializer};

pub trait MyTrait: for<'x> Deserialize<'x> {}

#[derive(Debug, Clone)]
struct Inner<T: MyTrait>(core::marker::PhantomData<T>);

impl<'de, T: MyTrait> Deserialize<'de> for Inner<T>
{
    fn deserialize<D: Deserializer<'de>>(_deserializer: D) -> Result<Self, D::Error> {
        unimplemented!()
    }
}

#[derive(Debug, Clone, Deserialize)]
pub struct Outer<T: MyTrait> {
    e: Inner<T>,
}

fn main() {}

This results in (on Rust 1.85):

error[E0283]: type annotations needed: cannot satisfy `T: Deserialize<'_>`
  --> src/main.rs:16:12
   |
16 | pub struct Outer<T: MyTrait> {
   |            ^^^^^^^^^^^^^^^^^
   |
note: multiple `impl`s or `where` clauses satisfying `T: Deserialize<'_>` found
  --> src/main.rs:15:24
   |
15 | #[derive(Debug, Clone, Deserialize)]
   |                        ^^^^^^^^^^^
16 | pub struct Outer<T: MyTrait> {
   |                     ^^^^^^^
note: required for `Outer<T>` to implement `Deserialize<'de>`
  --> src/main.rs:15:24
   |
15 | #[derive(Debug, Clone, Deserialize)]
   |                        ^^^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
16 | pub struct Outer<T: MyTrait> {
   |            ^^^^^^^^^^^^^^^^^
   = note: this error originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info)

<... long error output, see the playground link>

This may be related to #2463.