Hello LifeTimer,
No, I have not tested yet. I don’t have Python installed on my computer, so it will take some time to test it.
Can you reproduce the problem with another external tool? It might be an issue only specific to Python. I am not sure what your Python script does, but if your Python script expects any keyboard inputs, then I think EmEditor will have to give up keyboard shortcuts. Thus, this is an expected behavior.
By the way, I would appreciate if you could make a test case as simple as possible.
Thanks!