ambiguous reference error including Addressable Tools in a blank project.

[gltovar]

Library/PackageCache/com.unigame.unicore@2021.2.0/Editor/AssetOperations/AssetEditorTools.cs(545,18): error CS0121: The call is ambiguous between the following methods or properties: 'System.ObservableExtensions.Subscribe(System.IObservable)' and 'UniRx.ObservableExtensions.Subscribe(System.IObservable)'