The dashboard refreshes when you come back to it
Returning to a dashboard tab you left open reloads what it shows instead of leaving minutes-old information on screen.
Leaving the dashboard open in a background tab and coming back to it is how most people use it all day. Until now that tab kept showing whatever was true when you left, so a screen that had gone offline in the meantime still looked online until you reloaded by hand.
Returning to the tab now reloads what it shows. Statuses, playlists and content are current as of the moment you looked, not the moment you last clicked.