Originally Posted by brunos

Do you have any verifiable examples? Any example in the future?
I would love if that were true, but have never found any case over thousands of tries since CX introduced the restrictions maybe a year ago.

As I mentioned earlier, one explanation I got (besides the bad CX-BA relations) is that BA intra-Asia awards are very cheap in terms of avios and therefore in terms of what BA "pays" to CX.
As DPS is beyond 2,000 miles (140TP earned on HKG-DPS J tickets), the avios cost is high and that may cause more availability.