Just an update about the missing animation bug. It is not about Collision box feature, It is about the "Prettify XML" disabled bug.
1)Create 2 simple animations. (You must create more than 1 animation to see this bug)
2)Save project as scml with Prettify XML and JSON disabled.
3)Close and reopen project.
When open back the scml, the first or default animation will be missing. I hope you guys able to fix this bug.