This isn't a matter of debate.
There is no image evidence of H-6K/J carrying YJ-12 on its central fuselage.
It is useful for people to develop a reflex where if one sees a H-6K/J picture and think "might this picture show a YJ-12 under the fuselage" -- to automatically recognize that it is due to perspective/photo angle and to automatically search up all of the other angles of H-6K/J carrying YJ-12s in the past, which will help to understand that any YJ-12 thought to be carried on the centreline fuselage is actually just one the wing pylon instead.
I.e.: if it seems odd or exciting or new, pour plentiful cold water on oneself.