@ccc I didn't. But now I see what was meant.
So I tried again and indeed there is a bug.

Even with the Python script the effect is still the same. Seems to be an issue with the file saving.

If I change the text in document3 and then go to document1 and change something - the changes are okay in document3 but not in document1. It's as if Editorial hasn't had enough time to figure out that something changed yet. (If I wait about 10 seconds and run the script it works)