How to include an unattached View in the activity transition?

I draw a View that is not attached to any parent.

It's a decoration for a RecyclerView. The view sticks to the bottom and disappears when its counter part comes up in the list.

All this works fine but:

When i leave the activity the View doesn't fade with the rest of the views in the activity's transition.

It stays until the end of the animation and then disappears immediately.

( see large green view in the demo )

How do i include this unattached View in the activity's exit transition?

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I've create a minimal Android Studio Project to replicate the issue: https://github.com/Ostkontentitan/transition-issue-demo

(To better see the issue possibly set your phones animation scale to >= 5)

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Here is a demo:

from How to include an unattached View in the activity transition?