Show long text and down button

The show long text block currently accepts either A or Down to proceed when the text is displayed. I was surprised by the Down button. This isn’t explicitly documented but this looks like it’s related to a documented scrolling feature?

I put more than three lines of text up as an experiement and I can see that it then enables both Up and Down on the device to scroll around the text. Pressing Down when the final line is on screen still proceeds. It may not be obvious to users that they are on the last line and they could end up proceeding slightly prematurely.

splash only accepts A to proceeed. Both have an A icon which suggests to the user to press A.

Is this intentional?