I haven’t tried to export a video for a long time and today I thought it would great to send my colleague a sun study for a client.
I set up my scenes, saved everything, made sure all the scenes are included in animation, played the animation a few times to fix timing etc. Hit export >animation, got one file type MP4, okay fine.
Exported as usual and the file that resulted played the first scene only and showed the graphic with a broken line. Hopefully you can see the screenshots attached
As @rtches pointed out, there is a known bug with animation export with SketchUp 2024. I exported an animation from your file but got a different result from what you show. Still not correct, though.
You could open the file in SU2023 and export the animation from there.
At least you got all the scenes instead of just one.