I have been checking F award availability on SQ from SIN to SYD for every day of July, August and September 2022 for a while now and consistently there has been Saver and Advantage seats released following the same patterns

Just a few days ago I noticed that every day in the availability calendar shows as Waitlist across Saver and Advantage, even on days that previously had availability and as each day is opened there are no seats, just Waitlist.

Does anyone know what is going on here?

Thanks