Trying to use Stopwatch, getting "TypeError: t is null. "

I just upgraded to Jammy Jellyfish on Ubuntu. I haven’t used Stopwatch before but wanted to try it.

I’m getting an error, TypeError: t is null. See dev console (F12) and/or server logs for more info. when I try to add an activity.

"TypeError: Cannot read properties of undefined (reading 'map'). See dev console (F12) and/or server logs for more info." pointed me to the dev console (it really is as simple as F12) where I’m seeing this:

image

Upon further examination, it looks like Stopwatch did start. But I the “Stop” button generates the same error, and does not stop the activity. If I "Edit’ and uncheck “Running” I can save and that will stop the activity.