Really scratching my head at this one. Normally when I pause an app via a breakpoint, I see all of the threads in the debug navigator just below the "Network" area, with a stack trace in each thread. I'm not seeing anything.
I have "View process by thread" selected in the Debug navigator
I can see the threads in the bar above the lldb console (context menu is open)
Here is a screenshot.

Losing my mind!
It’s because you are filtering for UIAlert at the bottom of the debug navigator pane (bottom left of screen shot). Click the x in a circle to cancel the filter.
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