Android TV remote control app – back button not working

Hello fellow Kodi users.
I own a Razer Forge TV, I have installed Kodi 17.1 and I use a remote control app on my smartphone (the one from Razer and also stock one from Google). The back button works in every other Android TV app but in Kodi it does not work. Every other button works. Razer Forge TV is running Android 6.0.1 and my smartphone is on Android 7.0. Is there a solution / workaround for this or is this a bug known by the Kodi team and will get fixed in the future?