CCClippingNode use CCDrawNode as Stencil will have some problem

CCClippingNode use CCDrawNode as Stencil in Android will have some problem.

When App into background and coming back foreground, the CCClippingNode may disappear!

I use the sample code “ClippingNodeTest”

The “Scroll View Demo” is use CCDrawNode, when into background and coming back foreground.
The CCClippingNode is disappear.

But the “Hole Demo” is use CCSprite as Stencil, when into background and coming back foreground.
The CCClippingNode is correct

Does someone fixed this issue?