Why is the keyboard not showing in webview on android tv box?

Question

Android

An ordinary Chinese prefix with an android and a remote control, on the activity one webview in the entire parent.
I load html from the web there, it turns out to navigate through the fields with the keys on the remote control, but the keyboard does not open. If you press the central button of the joystick, you get a submit.
Has anyone encountered? By the way, everything is ok in a standard browser. Similarly on 4.2 and 4.3