Next button trigger not working when revisiting slide

Hello,
I have an landing page with four buttons. Each button leads to a separate scene.
I want to disable the Next button disabled until the learner has viewed all the scenes (ie: selected all the buttons)
I added a trigger to hide the Next button unless the state of all the button are visited.
But, when I return to the landing page and all the buttons are visited, the next button still doesn't show up. It's like my slide properties when I come back are messed up.
Any ideas or suggestions would be much appreciated!

 

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