ImmutableArray.AsReadOnlyFilteredView throws

[JohanLarsson]

  But was:  <System.NotSupportedException: Specified method is not supported.
   at System.Collections.Immutable.ImmutableArray`1.System.Collections.ICollection.get_SyncRoot()
   at Gu.Reactive.Internals.ListExt.SyncRootOrDefault(IEnumerable source, Object default)
   at Gu.Reactive.ReadonlyViewBase`2.Refresh(IReadOnlyList`1 changes)
   at Gu.Reactive.ReadOnlyFilteredView`1.Update(Chunk`1 changes)
   at System.Reactive.AnonymousSafeObserver`1.OnNext(T value) in D:\a\1\s\Rx.NET\Source\src\System.Reactive\AnonymousSafeObserver.cs:line 44