Scene - waiting for scene to finish doesn't work as expected

[klew]

I have a scene "Test 1s", which waits 1s and sends push notification:

Then I create a scene "Test 5x" which tries to start "Test 1s" 5 times with waiting for finish:

Expected result: I should get 5 notifications.
Actual result: I got only 3.

Waiting to scene to finish is implemented as a hidden delay, so it only adds "wait 1 s" between executions of "Test 1s".
It looks like scene "Test 1s" finishes after this timeout "wait 1s" and as a result every second scene run is failing (because previous execution is still running).