GridToPager does not work if we change the hierarchy

I tried GridToPager sample, it works as expected.
On the other hand when the GridFragment is itself the child of a viewPager the transition no longer works.
I have made a complete description of the problem here with the modified sample:
[here](https://stackoverflow.com/questions/61912623/how-to-implement-continuous-shared-element-transitions-recyclerview-to-viewpagl)
An idea would be welcome.