【RxSwift】subscribe 時に省略系を用いると onNext と onDisposed で同じクロージャが処理されたように見える

self.subject
    .take(1)
    .subscribe(onNext: { [weak self] _ in

         // 正常に動作する
         guard let self = self else { fatalError() }
         self.loadData()
    })
    .disposed(by: self.disposeBag)

self.subject
    .take(1)
    .subscribe { [weak self] _ in

         // 2回呼ばれてしまう
         guard let self = self else { fatalError() }
         self.loadData()
    }
    .disposed(by: self.disposeBag)

import RxSwift

import UIKit


// MARK: - TestViewController

final class TestViewController: UIViewController {


    // MARK: - UIViewController

    override func viewDidLoad() {

        super.viewDidLoad()

        self.subject
            .subscribe { (value: Int) in

                print("ラベル省略: onNext")
            }
            .disposed(by: self.disposeBag)

        self.subject
            .subscribe(onNext: { _ in

                print("値省略: onNext")
            })
            .disposed(by: self.disposeBag)

        self.subject
            .subscribe { _ in

                print("全省略: onNext")
            }
            .disposed(by: self.disposeBag)
    }


    // MARK: - Private

    private struct TestError: Error {}

    @IBAction private func onNextButtonTapped(_ sender: Any) {

        print("***** onNext ******")
        self.subject.onNext(1)
    }

    @IBAction private func onCompletedButtonTapped(_ sender: Any) {

        print("***** onCompleted ******")
        self.subject.onCompleted()
    }

    @IBAction func onErrorButtonTapped(_ sender: Any) {

        print("***** onError ******")
        self.subject.onError(TestError())
    }

    private let subject = PublishSubject<Int>()

    private let disposeBag = DisposeBag()
}

***** onNext ******
ラベル省略: onNext
値省略: onNext
全省略: onNext
***** onCompleted ******
全省略: onNext

***** onNext ******
ラベル省略: onNext
値省略: onNext
全省略: onNext
***** onError ******
全省略: onNext