Generic `StorageKey` impl fails to resolve `get()` on `StorageMap`, but concrete type works

[bitzoic]

When implementing methods on StorageKey<MyStorageType<T>> generically, calling .get() on a derived StorageKey<StorageMap<T, u64>> fails to compile.

However, the same code works when T is concretely specified (e.g. u64).

library;

use std::{
    hash::sha256,
};

pub struct MyStorageType<T> {}

// Fails to compile
impl<T> StorageKey<MyStorageType<T>> {
    fn internal_map(self) -> StorageKey<StorageMap<T, u64>> {
        StorageKey::new(self.slot(), self.offset(), sha256((self.field_id(), 2)))
    }

    fn foo(self, element: T) {
        let res = self.internal_map().get(element);
    }
}

// Compiles
impl StorageKey<MyStorageType<u64>> {
    fn internal_map(self) -> StorageKey<StorageMap<u64, u64>> {
        StorageKey::new(self.slot(), self.offset(), sha256((self.field_id(), 2)))
    }

    fn foo(self, element: u64) {
        let res = self.internal_map().get(element);
    }
}

Error:

"get(std::storage::storage_key::StorageKey<std::storage::storage_map::StorageMap<T, u64>>, T)" is not found for type "std::storage::storage_key::StorageKey<std::storage::storage_map::StorageMap<T, u64>>".

Testsed on forc v0.70.2