It can be seen in
TestCPP~~>PhysicsTest~~>Pyramid Stack
If we switch the android program to background and switch it back.
the sprites will move fast in random directions and leave an empty screen.
I have similar problem in my own project.
Yes, it’s a bug.
I created an issue for this bug:
http://www.cocos2d-x.org/issues/3509
I will notify you when this bug fixed.
Thanks for your report.
This bug has fixed at PR:
https://github.com/cocos2d/cocos2d-x/pull/4699
Fell free to test it.
Have fun!