can't disable directionalNavigation on xbox UWP

[vgrafe]

I use directionalNavigation on my hosted webapp. I'd like to prevent the user from focusing away while an animation happens, so I use the following before an animation TVJS.DirectionalNavigation.enabled = false; and the same with true after the animation completed. This works when debugging on browser, but not when running on device (Xbox One S and Xbox One).

I can see there's a Windows living in the global scope, but can not find any documentation about it. Does it provide a way to block the direction input, or maybe change the repeat rate?

Let me know if I should move this question to SO or somewhere else.