Masks disappear when nesting duplicated video !?

[Tune_]

Hey Guys , I have a video with a mask , the video is duplicated 3 times , when i nest the 3 of them , the masks disappear , how can i solve that ? 
Thank you in advance

[David Arbor]

Are you saying that you want to see the masks for all three clips when you click the nested clip or after nesting, clicking the actual clips with the masks no longer shows the masks?

[Tune_]

I actually cant see the mask after nesting , it just disappears after i nest the clips ! but with individual clips the masks are still there 

[David Arbor · Accepted solution]

This is normal behavior—having masks "pass through" would somewhat defeat the purpose of a nest, which is to make your group of clips appear like a new, single clip. 

[Tune_]

Thank you David , I will apply the mask after nesting the clips then ! appreciate your help