There's a bug that shows the object menu even if you don't tap on any of them:
I accidentally got it from tapping near the home button in the editor, and it happens in projects that have more than two objects.
When I tested it out on two-object projects, it makes it seem like you tapped on one of the objects:
On one-object projects it does nothing.
It might just be for iPad mini 3s, but I don't know.