Can the Pick One freeform question in Storyline be made accessible?

I am developing a course in Storyline 360 that incorporates the Pick One freeform question type. When using keyboard navigation, I can tab to the first item in the button set. However, when I use the arrow keys to navigate to the other selectable items, the object is selected as soon as it comes into focus. Is this standard behavior?

In addition, the client has requested the removal of the player frame for this project. As a result, the built-in submit button has been removed.

I have attached a file that functions similar to what I'm experiencing. I would appreciate any thoughts on how I can make adjustments for learners using keyboard navigation. Thanks in advance!