Bug [UQuery] Query returning empty object, have to wait a frame for it to somehow turn normal

When this code runs

Code (CSharp):

1. m_ReferenceType= m_Root.Q<EnumField>();

the m_ReferenceType variable is fed with the values in the screenshot. In order for the variable to be fed with normal values I have to utilise the EditorCoroutines package - run the code above and wait a frame. Is this a bug or am I just misunderstanding how the UQuery system is supposed to work?

Unity version - 2019.3.0a6.

 

This is the UXML file from which my custom editor is created:

Code (CSharp):

1. <UXML
2.     xmlns="UnityEngine.UIElements"
3.     xmlns:ed="UnityEditor.UIElements"
4.     xmlns:t="Tankmania.EditorExtensions">
5.  
6.     <IMGUIContainer name="script-field" />
7.     <TextField label="Component Name" binding-path="componentName" />
8.     <ed:EnumField label="Reference Type" binding-path="referenceType" />
9.  
10.     <t:IndentScope name="var-reference-container" indent-level="1">
11.         <TextField label="Variable Name" binding-path="varName" />
12.     </t:IndentScope>
13.  
14.     <t:IndentScope name="method-reference-container" indent-level="1">
15.         <TextField label="Method Name" binding-path="methodName" />
16.         <ed:PropertyField name="methodParameters" binding-path="methodParameters" />
17.     </t:IndentScope>
18.  
19.     <VisualElement name="validate-btn">
20.         <t:Space />
21.         <Button text="Validate" />
22.     </VisualElement>
23. </UXML>

 

m_Root

is the root element to which every other VisualElement is added.

Code (CSharp):

1. m_Root = new VisualElement();
2. VisualTreeAsset tree = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(THIS_FOLDER_PATH + "/ComponentReferenceHandlerEditorTree.uxml");
3.             tree.CloneTree(m_Root);

 

Thanks!