You should then have the option to Play or to Add to Save LIst
My personal preference is Haystack News and Newsy. But I will try to accept those may not fit your preferences. Until the issue with OAN app is fixed, The Roku Channel method to access might be the best work-around.
Apologies for the inconvenience. We would like to know what went wrong to assist you further and fix the issue. Have you tried removing the channel you observe this issue? Then, restart your device. Once it loads up again, add the channel and try playing content again. In addition, do you observe this issue prior to the OS update?
Once we have this information, we will be able to investigate further.