Bug editing models...

[Caronte3D]

Steps to reproduce the bug:
Add a model to the scene, then later edit the model because you want it to have a collider. Save the model.
Now if you move the model on the scene, you can see another one on the original position, but not selectable, also, not show in play mode.
To get rid of that dummy model, you need to save and load the map again.

[Josh]

You are correct. Thank you for the simple instructions, I have seen this occasionally happen, but your example gives me a very easy way to produce the error.