Hi.
I have the same problem here.
On my Construct 3, when I duplicate a layout, Construct randomly crashes about 1 every 3 or 4 duplicates.
I have to mention that my project has 1600+ layouts and 400+ object types.
To prevent losses of my work, I have to save my project every time I duplicate and reload it after crash.
It's a huge loss of productivity.
Thanks.
Mat