Auto Completion doesn't work after running a testcase on MacOS

Hi,
I have a problem in using RIDE. When I open RIDE, auto completion shortcut key option+space works well. But after I run a testcase, it seems that the shortcut keys does not work any more until I restart RIDE. 
Is this a bug? Or is there some workaround to avoid this problem?
Thanks.

- RIDE v2.0b2.dev3 running on Python 3.9.7.
- MacOS  Big Sir Version 11.6

