When reset a MovieSceneObjectBindingID type property, the display of the property is not reset but keep the value before reset, until the property form is clicked.
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Use the attached repro project to skip Step 1 - 12. Open LV_Test and edit the level sequencer for Step 13 - 15.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-212751 in the post.