Nope. It's been that way for quite some time. Can't do the same city pair twice in the same direction.
SYD-MEL-BNE-SYD-BNE is fine, BNE-MEL-SYD-BNE-MEL isn't.
xONEx fare rules
2 (i) The same city pairs/sectors cannot be flown more than once in the same direction