Navigation between transitioner slides not working

まだ誰も着手していません。

### Bug explanation

I have a project with the following structure:

It has a MainWindow with a transitioner with 5 slides (HomeScreen, SellType, CustomerName, Sells, Logout) where Sells slide has a transitioner with 3 slides (Subgroups, Products, ProductConfig).

There is a routine in Sells to return to SellType slide in MainWindow. The problem is that when the slide loaded in Sells transitioner is Subgroups the SellType load normally, but when it's the Products slide, the transitioner doesn't load the SellType.

However, when I set the routine in Sells slide to return to HomeScreen and Subgroups slide is loaded in Sells transitioner, nothing happens, but if Products slide is loaded, Home screen is loaded.

If I set the routine in Sells slide to return to CustomerName, all slides in Sells transitioner are capable to load it normally.

The slides here are UserControls.

### Version

4.5.0

レポートに記載された MainWindow transitioner、ネストされた Sells transitioner、UserControl slides を使ってナビゲーションの問題を再現します。各ネストされた slide から SellType、HomeScreen、CustomerName に戻るテストを行い、すべての route が要求された parent slide を一貫して読み込むことを確認します。

索引モデルが issue の本文から書いたものです。