The same subgraph window can be opened multiple times after a domain reload

Exception thrown while invoking [OnOpenAssetAttribute] method 'VisualEffectAssetEditor:OnOpenVFX (UnityEngine.EntityId,int)' : InvalidOperationException: Sequence contains more than one matching element
System.Linq.Enumerable.SingleOrDefault[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) (at <175a161e03894f66a250f0632be3e461>:0)
UnityEditor.VFX.UI.VFXViewWindow.GetWindowLambda (System.Func`2[T,TResult] func, System.Boolean createIfNeeded, System.Boolean show) (at ./Library/PackageCache/com.unity.visualeffectgraph@162a3b265f04/Editor/GraphView/VFXViewWindow.cs:93) 

InvalidOperationException: Sequence contains more than one matching element
System.Linq.Enumerable.SingleOrDefault[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) (at <175a161e03894f66a250f0632be3e461>:0)
UnityEditor.VFX.UI.VFXViewWindow.GetWindowLambda (System.Func`2[T,TResult] func, System.Boolean createIfNeeded, System.Boolean show) (at ./Library/PackageCache/com.unity.visualeffectgraph@162a3b265f04/Editor/GraphView/VFXViewWindow.cs:93)