Reproduction steps:
1. Open the user's attached project ("GUILayoutError.zip")
2. Select a GameObject from the Hierarchy window
3. Click the "Button" in the Inspector window
4. Close the SaveFilePanel (Click Cancel, Save, X or hit the ESC key)
Expected result: There are no errors in the Console window
Actual result: An error is thrown:
EndLayoutGroup: BeginLayoutGroup must be called first.
UnityEngine.GUI/Scope:Dispose ()
Reproducible with: 2020.3.21f1, 2020.3.24f1, 2021.2.0b15, 2021.2.5f1, 2022.1.0a10, 2022.1.0b1
Not reproducible with: 2019.4.33f1, 2020.3.20f1, 2021.2.0b14, 2022.1.0a9
Notes:
1. If it doesn't reproduce, try repeating steps 3-4
2. Reproducible on Windows, a similar issue exists on macOS: https://issuetracker.unity3d.com/product/unity/issues/guid/1386486/
Workaround: Adding GUIUtility.ExitGUI(); after invoking the SaveFilePanel