Issues with pairing Logitech K380 Bluetooth Keyboard

## What I am expecting to happen
1. Open Bluetooth preferences
2. Add keyboard
3. Authenticate by typing the code that is displayed in the Bluetooth authentication process
4. Finish authorizing the keyboard
5. Keyboard is added to the saved devices list

## What is happening
1. Open Bluetooth preferences
2. Add keyboard
3. Authenticate by typing the code that is displayed in the Bluetooth authentication process
4. **While trying to authenticate the keyboard a new authentication window panel is opened for every authentication character entered through the keyboard. This fills up the screen with authentication windows that you cant close thus freezing the preferences panel.**

Sometimes the authentication will succeed (although the preferences panel will be frozen) the OS has trouble re-pairing the keyboard after a restart.

This is reproducible for me 100%.

I think it could be reproducible with other keyboards that require entering a string for authentication.

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elementary OS 5.1.7 Hera
Built on Ubuntu 18.04.4 LTS
GTK 3.22.30