29OCT is the end of the planning season ("winter 22") and is a natural cut off date.
While normally they would have some tentative schedules (specially for core routes like MEL-SYD) loaded and planned, it is likely just that YM have not hit go on release of the usual reward seats for whatever reasons. Given the last two years it's possibly understandable though unusual.
I did wonder if it was a factor possibly of the 330 day cut off for non status folks kicking in, but yes absolutely as a P1 I see seats til Oct 29, then crickets. Or potentially an indication that QFF may be dialing back the availability window for all? Seems very unlikely though.
I'm sure they'll sort it out at some stage soon.