This seems like a pretty serious issue. Not just the radio.
https://www.geekwire.com/2022/youre-listening-to-kuow-like-i...
https://news.ycombinator.com/item?id=30268294
(HD Radio, not RDS)
Only by stopping and restarting the engine could you get out. [1]
But these Mazdas can't even get out that way!
[1] See item 8: http://blog.tyrannyofthemouse.com/2008/07/setting-sync-strai...