When Simulator window is maximized, On switching 'Simulator window' to 'Game View' resulting 'Invalid editor window' error thrown in console. Refer attached video for reference.

Step to reproduce:
1. Create a new project
2. Game View > Switch Game To Simulator
3. Simulator > Maximize
4. Simulator > Switch to Game View
5. Repeat steps 3 to 4 at least 2-3 times.

Actual Result:
'Invalid editor window' error thrown on switching maximized Simulator window to Game View.

Expected Result:
On switching maximized Simulator window to Game View, it should switch gracefully without throwing any error.

Reproducible in:
2021.1.0a3

Note:
Device Simulator windows as a core feature of the Editor introduced in 2021.1.0a3.

Environment:
Occurring on macOS 10.15

Stack Trace:
Invalid editor window UnityEditor.GameView
UnityEditor.GenericMenu:CatchMenu (object,string[],int) (at /Users/bokken/buildslave/unity/build/Editor/Mono/GUI/GenericMenu.cs:124)