1x4 is not 4x1 in the NLA editor (a stripe question) ?

Hi all,

I am asking help about a stripe problem.
Maybe I am missing something here.
I have made a simple animation for a wall with either a large NLA stripe with 4 actions (1x4 “restrict view”) or 4 small stripes with one action each (4x1 “restrict view”).
At the end I should get the same result :a visible wall at frame 12.
This is not the case.

A bit puzzling to me. I still in the learning curve so simple advices are welcome.

Here is the Blender file: