Something similar happened during a long layover in the DXB lounge. My connecting flight was full in Y and my seat number had disappeared. I was very happy and was waiting for the beep at the gate ( and for them to re print my boarding pass to J)

Sadly nothing happened and I was not opped up.

I don't check anymore and if I get an op up I just take it as a pleasant surprise .


PS: I did post about this incident which happened last year and some of the posters commented that I should have asked for a fresh boarding pass in the lounge itself. I'm not sure if that would have made a difference.