The bug

Typing in text fields can toggle the narrator. This is especially problematic for keyboard layouts where Ctrl + B (shortcut for toggling the narrator) is used to write a different character, for example Czech, Slovak, Hungarian, Croatian, Slovenian, Serbian and a few other Slavic language keyboards where the way to type "{" is Ctrl + Alt + B, or Alt Gr + B.

How to reproduce

1. Switch your keyboard language to any of the stated above, Czech for example.
2. Open the chat.
3. Press Ctrl + Alt + B

I tried tinkering with the options but I could not find a way to disable the narrator completely or change the shortcut used to toggle it. If there is a way to achieve any of the two, let me know. In any case, that would at least be a workaround.