Default drawer for ExposedReference on UIToolkit updates only last instantiated field on window

Steps to reproduce:
1. Open the attached user's project "ExposedReferenceDrawerBugSample.zip"
2. Open the "ReproScene.unity" Scene
3. Open the custom Editor Window via "Repro" > "Exposed Reference Repro Window"
4. Drag "TargetA" from the Hierarchy onto the "Target 0" field in the UI Toolkit section
5. Observe the "Target 0" and "Target 2" fields

Actual result: The dragged object is assigned to the last instantiated field ("Target 2") instead of the field it was dropped on (See attached ReproVideo.mov)
Expected result: The dragged object is assigned to the field it was dropped on ("Target 0")

Reproducible with: 6000.0.83f1, 6000.3.23f1, 6000.6.0f1, 6000.7.0a6

Testing Environment: Windows 11
Not reproducible on: no other environment tested

Notes:
-Only the default UI Toolkit drawer for ExposedReference is affected; the IMGUI section of the same window behaves correctly
-Also reproducible when assigning via the object picker instead of drag & drop