Mystery trigger "Jump to next slide when timeline on this slide starts"

Unfortunately, I was unable to use Phil's approach because my connecting link was somehow disabled. So I tried a different approach: I created another scene and added the faulty slides there, and the mystery link/trigger was gone.

Please note: you need to make adjustments to your player’s ‘menu items’ since a new scene has been introduced. You can delete the scene’s heading and keep the sub-slides (children slides) as is.

I hope this helps! 😊