Steps to reproduce:
1. Create new Unity project
2. Open Multiplayer Center window
3. Dock Multiplayer Center window next Inspector tab
4. Open Inspector tab (Inspector window focused)
5. Resize Inspector window

Actual results: Errors thrown in the Console when resizing Inspector window
Expected results: 

Reproducible with versions: 1.0.1 (6000.0.43f1, 6000.1.0b11, 6000.2.0a7)
Can’t test with versions: 2022.3.60f1

Tested on (OS): Apple M1 Max, Sequoia 15.2

Notes:

•  sometimes it’s enough just to open Inspector window and errors will be thrown once Multiplayer Center window is docked

{code:java}
m_GateCount > 0
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) (at /Users/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:219)
{code}

{code:java}
ArgumentException: Cannot unschedule unknown scheduled function UnityEngine.UIElements.VisualElement+SimpleScheduledItem
UnityEngine.UIElements.TimerEventScheduler.Unschedule (UnityEngine.UIElements.ScheduledItem item) (at /Users/bokken/build/output/unity/unity/Modules/UIElements/Core/Scheduler.cs:305)
UnityEngine.UIElements.VisualElement+BaseVisualElementScheduledItem.OnPanelDeactivate () (at /Users/bokken/build/output/unity/unity/Modules/UIElements/Core/VisualElementScheduler.cs:316)
UnityEngine.UIElements.VisualElement+BaseVisualElementScheduledItem.SendDeactivation () (at /Users/bokken/build/output/unity/unity/Modules/UIElements/Core/VisualElementScheduler.cs:209)
UnityEngine.UIElements.VisualElement+BaseVisualElementScheduledItem.OnElementDetachFromPanelCallback (UnityEngine.UIElements.DetachFromPanelEvent evt) (at /Users/bokken/build/output/unity/unity/Modules/UIElements/Core/VisualElementScheduler.cs:229)
UnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt) (at /Users/bokken/build/output/unity/unity/Modules/UIElements/Core/Events/EventCallback.cs:64)
{code}