TKinter doesn't return focus to Ipython window

[timhockswender]

Running 6.6.0 in Windows11. In order to continue editing fter the script runs, I need to delete the current kernel and a new one is created. This was not the behavior a year ago. I changed graphics backend to Tk from Automatic but not help. I can get by to destroy the kernel but I don't think it should be necessary. Advice appreciated.