Bug Custom inspector: NullReferenceException when dragging onto a field under an Array.

Hi,
I made a custom inspector:

Code (CSharp):

1. [CustomEditor(typeof(FieldNotificationForwarderReceiverMB), true)]
2. public class FieldNotificationForwarderReceiverMBEditor : Editor
3. {
4.     public override VisualElement CreateInspectorGUI()
5.     {
6.         VisualElement inspector = new VisualElement();
7.         InspectorElement.FillDefaultInspector(inspector, serializedObject, this);
8.         return inspector;
9.     }
10. }

It should draw an array, of an array (Which works). It looks like this:


(InstantiateOnEventMB is a child of FieldNotificationForwarderReceiverMB)
The problem: Whenever dragging an object onto an element inside of an array, it throws a NullReferenceException. When dragging an Object on the "Asd" field (Bottom of the picture), which is outside of an array, it works.
But, clicking on the circle of an array element and selecting an object does work. Only dragging doesn't.

I appreciate any help.
P.s. Please add the functionality of spoilers to threads, so a post with pictures and code isn't so long and intimidating to read through.

Thanks!

 

Hahaha, seems like I'm not the only one with this problem

Once I have time, I'll try to file a bug report.

Anyways, I just want to add, that the VisualElement system is way better in comparison to the IMGUI system. This might be off-topic, but is there a date at which I could expect UIBuilder to leave pre-release, and to fully release?

 

Sorry, I meant experimental.

 

Huh, this is what it shows in the package manager for me:

Am I missing something here?