The bisected PR related to time slicing in the Inspector ensures better system responsiveness. The reported error is inconsistent due to interference with the Inspector's responsiveness. Instead of altering the Inspector's behaviour, we optimized the user script:

Caching the Target Component: Instead of using FindObjectOfType, which searches the entire scene, directly cast the target property to your component in OnEnable. This ensures you're working directly with the component attached to the inspected object.

Setting hideFlags in OnEnable: Setting HideFlags.HideInInspector once in OnEnable ensures it's applied when the Inspector is first enabled, rather than repeatedly in OnInspectorGUI.
After hiding the component from the Inspector, users can still access it via debug mode for script manipulation.

User-provided Script:
[CustomEditor(typeof(ExampleComponent))]
public class HideInInspectorExample : Editor
{
public override void OnInspectorGUI()
{
var myComponent = FindObjectOfType<ExampleComponent>();
myComponent.hideFlags = HideFlags.HideInInspector;

base.OnInspectorGUI();
}
}

Modified script:
[CustomEditor(typeof(ExampleComponent))]
public class HideInInspectorExample : Editor
{
private ExampleComponent myComponent;

private void OnEnable()
{
myComponent = (ExampleComponent)target;
myComponent.hideFlags = HideFlags.HideInInspector;
}
}