Reproduced a bug-
Here is how to reproduce-
In any grid in panel operation add "Add reference and use query(filter selection list) to get the reference. Parent-children
Now if you use standard grid then it works. As soon as your query representation becomes custom then add reference breaks apart(it does not work).
I must use add reference but with query and custom representation.
Right now Add reference(click stops working) breaks when your filter selection list query becomes custom representation....