Blueprint Drop Down Menu Select Feature Not Working for BehaviorTree

The drop down menu in my enemy blueprint seems to be bugged. I can’t select any of the available behavior trees listed in the menu. I have had success selecting the “create Behavior Tree” menu item at the top of the drop down. I could then clear and select that particular Behavior Tree I’d just created through the drop down menu. Is this expected behavior from the drop down menu?

try to use <=

what does that mean?

may be this is a bug.
but if u want to select tree.
try this.
QQ图片20220227113939

I had already tried that and it didn’t work.