Cliping Mask doesn't work when they're import in Illustrator

Hi everyone !

I create vector illustrations in Fresco App on Ipad. They're composed from clipping mask. Then I import them on Illustrator on my desktop. Everything is ok at this point.

The issue come when I select all the imported elements in Illustrator, and copy paste them on an other Illustrator document : since this morning, my clipping masks disappear.

Is someone please have an idea ?

I update Illustrator and I also try with an old visual, it didn't work anymore.

Thanks in advance for your help !

(And sorry for my bad english)