QF35, the 1220 MEL - SIN is most unusually predicted to depart at the same time but its destination is SYD. It looks to be then heading for SIN at 1715 hours for a forecast 2230 hours arrival in the Lion City. QF5, the normally scheduled 1715 hours SYD - SIN has been cancelled, suggesting either that one A333 or a suitable A332 has failed, that passenger loadings are so light that the flights are combining or there are problems with staff availability.
Similarly QF29, the 1115 hours MEL - HKG has been cancelled and replaced by a flight bearing the same number to SYD, where arrival is suggested as 1240 hours and departure at 1340 with a resultant 1740 hours arrival in HKG, although the latter time must be a mistake as that is only a gate-to-gate time of seven hours from SYD to HKG.
Perhaps my suggestions as to the reason above are all incorrect and there is something else occurring? Very, very odd to have two QFi Asian flights ex MEL both altering to operate via SYD.