Spark 2.6.3 Daily/Weekly build Broadcast Message issue

I am experiancing an issue that I am not sure is a feature or a bug. But when broacasting messages the last individual user you sent a message to automatcily gets selected when you choose Boradcast, you have to uncheck the user each time when you enter the boardcast message pop up. Does anyone know why this happens and if there is a way you can stop it from doing that?

Actually i have reported this 4 years ago SPARK-1088. But nobody have looked into this yet.