Window state sometimes not correctly restored

Thunar git master 4.18.0+507+g6b0387bd and Thunar 4.18.6

First use case:

• Open Thunar (previous saved state should be non-maximized)
• Maximize the window
• Unmaximize the window
• Close the window quickly enough after is has been unmaximized (e.g. via Alt+F4 after clicking on unmaximize)
• Reopen Thunar

The window is maximized when it shouldn't be.

Second use case:

• Open Thunar (previous saved state should be non-maximized)
• Open another Thunar window
• Maximize the first window
• Close the first window
• Close the second window
• Reopen Thunar

The window is maximized when it shouldn't be.