I have a fresh setup of Openfire 4.5.2 with multiple conference rooms. Using Spark 2.8.3 the initial bookmarking of the conference room shows the Name of the room and double clicking the room will open the chat window with the tab being the same name.
After logging out of Spark and back in all conference rooms that have been bookmarked now show with the Room ID. When joining the room by either clicking the room in the conference tab or by auto join the chat tab also shows the Room ID.
This does not happen when using Spark 2.6.3.