That is not code, but a picture of code. So we can't run it for ourselves.
That said, it looks pretty simple. So I can't see why LV20 would behave differently than LV19.
You say "the VI runs without errors", but how do you know? Have you probed the error wire or put an indicator on it? Right now if there is an error on that lone LINX VI in the loop, you won't see it because it reaches the tunnel. You are "handling it" which means the automatic error handler won't pop up any dialogs.
Should you have a wait function in that loop?
