From BBC: Singapore and Australia's aviation authorities have temporarily banned Boeing 737 Max aircraft from flying into and out of their countries.
https://www.bbc.com/news/world-asia-47536502
But hey, it must be illogical to try to avoid the MAX. On the off chance there's an equipment swap. (Even in June, notwithstanding that more of the flights are on the 737 MAX, there are options YYZ - YVR, if one is flexible.)