Nope, these issues are not detected at first stage it would seem. It is just relied on that the stage one bod knows how to read a splitter and uses a spare from the right tray.......
I think the issue you had was different .... The fibres feeding the splitter (E sides, as it were) were misrouted , resulting in no light at all.
What the OP mentions, (and I am guessing here, from what�s been said) as it�s on a fibre from the wrong SASA tray in the splitter, although it has been lit from the exchange the serial number is not appearing where expected on the head end .....
The head end has been told for order XXX the light/serial number from the ONT should appear on fibre X in tray Y .... once in agreement �sync� sorta, it then gets the remote build for the services ......
If the serial number number is appearing on a different tray in the exchange, sync/lit PON light (whatever it might be called) doesn�t occur.
It does make the flashing PON light on the ONT momentarily �hang� every few minutes ... and that seems to be the tell tale.