Not that anyone will do this without intention, but if you leave it on the screen where the top live matches are shown, they don't update at all and the timer keeps ticking as if the matches were still happening.
Wouldn't hurt to replace done matches.
Only way to refresh is to go to another tab and come back to Today, I suppose the Watch tab does the refresh, since I tried the Updates one first and it didn't work, then pressed them all and came back.