[Bug]: spying on getters that return complex functions throws type never error

[jbsil]

Version

29.1.0

Steps to reproduce

jest.spyOn for getters/setters seems to work correctly with most Types, but breaks with any complex function type.

type CustomType = {
  hello: string;
  world: World;
}
class World {
  innitialize() {
    console.log('hello');
  }
};
class Example {
  get hello() {
    return 'world';
  }
  get world(): CustomType {
    return {
      hello: 'world',
      world: new World(),
    };
  }
  get nativeFunction(): Function {
    return () => {};
  }
  set nativeFunction(_: Function) {
    // do nothing
  }
  get worldFactory(): () => () => World{
    return () => () => new World();
  }
  set worldFactory(_: () => () => World) {
    // do nothing
  }
}

const example = new Example();
jest.spyOn(example, 'hello', 'get').mockReturnValue('mocked');
jest.spyOn(example, 'world', 'get').mockReturnValue({hello: 'mocked',world: new World()});
jest.spyOn(example, 'nativeFunction', 'get').mockReturnValue(jest.fn());
jest.spyOn(example, 'nativeFunction', 'set').mockImplementation(jest.fn());
jest.spyOn(example, 'worldFactory', 'get').mockReturnValue(() => () => new World());
//----------------------------------^ Argument of type 'string' is not assignable to parameter of type 'never'.
jest.spyOn(example, 'worldFactory', 'set').mockImplementation(jest.fn());
//----------------------------------^ Argument of type 'string' is not assignable to parameter of type 'never'.

Expected behavior

I expect that all Types should be usable while spying on getters and setters

Actual behavior

complex getters and setters always throw Argument of type 'string' is not assignable to parameter of type 'never'.
or Argument of type '"<getter name>"' is not assignable to parameter of type '"<other>" | "<valid>" | "<getters>"'. (The latter is probably keyOf Type, and the complex getter is somehow excluded from those keys?)

Debug log

ts-jest.log

Additional context

the error is different if you import jest from @jest/globals

import { jest } from '@jest/globals';
type CustomType = {
  hello: string;
  world: World;
}
class World {
  innitialize() {
    console.log('hello');
  }
};
class Example {
  get hello() {
    return 'world';
  }
  get world(): CustomType {
    return {
      hello: 'world',
      world: new World(),
    };
  }
  get nativeFunction(): Function {
    return () => {};
  }
  set nativeFunction(_: Function) {
    // do nothing
  }
  get worldFactory(): () => () => World{
    return () => () => new World();
  }
  set worldFactory(_: () => () => World) {
    // do nothing
  }
}

const example = new Example();
jest.spyOn(example, 'hello', 'get').mockReturnValue('mocked');
jest.spyOn(example, 'world', 'get').mockReturnValue({hello: 'mocked',world: new World()});
jest.spyOn(example, 'nativeFunction', 'get').mockReturnValue(jest.fn());
jest.spyOn(example, 'nativeFunction', 'set').mockImplementation(jest.fn());
jest.spyOn(example, 'worldFactory', 'get').mockReturnValue(() => () => new World());
//------------------^ Argument of type '"worldFactory"' is not assignable to parameter of type '"world" | "hello" | "nativeFunction"'.
jest.spyOn(example, 'worldFactory', 'set').mockImplementation(jest.fn());
//------------------^ Argument of type '"worldFactory"' is not assignable to parameter of type '"world" | "hello" | "nativeFunction"'.

Environment

System:
    OS: macOS 13.4
    CPU: (10) arm64 Apple M1 Pro
  Binaries:
    Node: 18.9.0 - ~/.nvm/versions/node/v18.9.0/bin/node
    npm: 8.19.1 - ~/.nvm/versions/node/v18.9.0/bin/npm