There is no way to reproduce the issue if you do not provide a .blend file or exact step to reproduce.
but this looks like a visibility issue.
You could try to;
🔴 check Developer Extras in…
Maybe you have the Experimental Grease pencil 3.0 activated if you turn it off it should work again.
This doesn't look like a manual/documentation issue. Use this bug reporting guide to help you report the issue.
Check the manual out :https://docs.blender.org/manual/en/dev/files/blend/open_save.html#recove.
As @PratikPB2123 said, you only have a single scene 🔵 in the file you shared.
To add a scene click on the new scene button…
No issue here then. Please close it @Christopher-Tyler.
maybe the "SINGLE STAIR" collection is using this offset:
There is something not right indeed. using 7z to open it, there is a 'Not Found (404)' 404.html page at the root.