Notice how it adds a "backspace" if I use tab to select the replacement from suggestions.
Strings without accent work as expected.
Interestingly, some wrapped Store apps such as OneNote 2016, Spotify and Word 2016 work greatly. So, this may be limited to true UWP apps only.
This is not an issue for me anymore, since these small circumstances are rare for me. So, I'm only trying to help improve your great app
