Turns out this minor issue is not new to SD8. I just hadn’t noticed before.
If I make a change to a script, don’t compile, but instead immediately run, the Script Timer does not update while the script is in progress. It stays at 00:00:00:00 until the script completes, and then it shows the total time.
If I compile the script first, then run, the timer updates continually.
No big deal to me.