Unity crashes when using ExecuteAlways on a UIBehaviour

Hey,

because of some limitations with the existing AspectRatioFitter (not being able to set RectTransform anchors when using modes FitInParent or EnvelopeParentand thus requiring an extra wrapper object), I've written a custom AspectRatioFitter called AnchorAspectFitter. Like Unity's version, mine inherits from UIBehaviour (and was implementing ILayoutSelfController for a time).

All my script is doing, is making some calculations and then setting offsetMin and offsetMax of its RectTransform. Additionally, I'm using the DrivenRectTransformTracker to block the associated RectTransform values in the editor. All code related to this is wrapped in #if UNITY_EDITOR directives.

The function which does the above is called in the inherited functions OnEnable and OnRectTransformDimensionsChange. I've also written a custom inspector that calls this function in OnEnable and when detecting changes in OnInspectorGUI. Now, the issue this presents is that the layout is only updated outside of play mode, when the object gains focus in the inspector or is changed. So unlike Unity's AspectRatioFitter, the layout is not updated when some parent or the canvas is resized, the resolution is changed etc. A simple remedy should be to use the [ExecuteAlways] or [ExecuteInEditMode] attribute (like Unity's AspectRatioFitter does), but whenever I try this, dragging a parent RectTransform anchor or trying to open the PrefabView will cause Unity to freeze and crash.

Am I doing something terribly wrong here or is there a general issue when combining a custom UIBehaviour with the ExecuteAlways attribute? Should I report a bug?