Looking at various pictures of the PLA using type 56 semi, most of them up to the Sino-Vietnamese conflicts starting from 1979 shows the rifle being used with bayonet extended.
The rifle was decommissioned in 1985, largely replaced by type 81. They are still used by militia reserve. Pictures from their use in more modern times shows a mixed of bayonet extended and folded:
So I'd say likely the official doctrine for PLA is zero the rifle with bayonet extended.
As of the rifles exported to Canada, who knows. It might be an unaltered one retaining zero with bayo extended, or one taken from the militia reserve where it was zeroed to their local preference, or could be a mix bag of part and not zeroed at all.