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Element (hide/show) won't come back

First off, thanks to all of you who help, it is very much appreciated.

I’m trying to get a down arrow to hide once it moves beyond a section, and then return once that section (a video) comes back into view. I have the interaction set up. It goes away, but although I have set up another interaction to return, it doesn’t.

It’s test page just to sort this out - video test page - I want the arrow to go away once the brown section appears (it does) and then return if the viewer scrolls back up bringing the video back into view (it doesn’t return). I’m sure I just overlooked something simple…

Here is my public share link: LINK
(how to access public share link)