The hardware video driver is no longer being enabled in the current released version, 4.7.0 or the current beta version. It makes my FireTV Max devices unusable for playing video (Excessive dropped frames causing video to lockup, must restart FireTV to clear). I have verified this problem on my Shield, Google Chromecast TV, Sony Google TV, along with my FireTV Max devices. I sent diagnostics from client.
As a side note, I have noticed the released version app size is double from previous builds on the FireTV Max devices.