How can I check SerializedPropertyChangeEvent to see if changedProperty is valid?

As part of my custom PropertyDrawer I have an enum in a PropertyField for which I've used RegisterValueChangeCallback() to watch it for changes so I can re-draw fields in my VisualElement when appropriate.

I have a MonoBehaviour which holds a List of these Properties, and if I delete an entry from the encapsulating List, a SerializedPropertyChangeEvent will get sent to the VisualElement for the Property that is getting destroyed. As far as I can tell, there's no way to check for this from either the SerializedPropertyChangeEvent or the PropertyField, but as soon as I try to access a field on the changedProperty, I get an error in console saying:

SerializedProperty My.Long.Property.Path.data[i] has disappeared

Since it's an error I can't wrap anything in a try/catch, so I'm left wondering if there are any mechanisms at all to check that an event is valid before I hit the error?

Code looks roughly like this:

 void OnModeChange(SerializedPropertyChangeEvent evt)
 {
     if (evt.currentTarget != m_ModeField ||
         evt.changedProperty.propertyType != SerializedPropertyType.Enum ||
         (AssetFilter.FilterMode)evt.changedProperty.enumValueIndex == m_LastModeRendered)
     {
         return;
     }
     ClearTransientFields();
     DrawConditionalModeFields();
     m_ModeProperty.serializedObject.ApplyModifiedProperties();
     MarkDirtyRepaint();
 }

As soon as I try to access any field in changedProperty I will get the error, but I can't figure out what field, if any exists, I could check to ensure changedProperty points at a valid object before I access it.