Focus Order - Hidden Buttons which Show After Multiple Variables Changed

I am reviewing my notes on focus order and realized I have created something, but I am unsure how to deal with it when reviewing the Focus Order box.

I created a hidden button to move the learner to another section when they complete tasks on seven dialog layers (variables were created; the button shows as expected).

The button Alt Text reads "Go to ??? section".

My questions:

1) How will this hidden button affect keyboard tabbing and screen readers?

2) Do I remove or keep it in the focus order box?

3) Anything else I need to consider for accessibility?

Thanks in advance!