Hello from here as well and thanks for sending the reproduction project!
For the shake of this post completeness and for others looking for this until the next version release, the fix is rather easy:
Simply open up Blackboard.cs and change line # 50,
From This: UndoUtility.RecordObjectComplete(this, UndoUtility.GetLastOperationNameOr("Blackboard Change"));
To This: UndoUtility.RecordObject(this, UndoUtility.GetLastOperationNameOr("Blackboard Change"));
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