I have very little knowledge of physics, so I apologize if this is a wrongheaded question, or phrased poorly.
I'm trying to get my head around an aspect of negative mass. I understand that, as explained in this earlier Phys.SE question, there is a theoretical category of exotic matter that is called negative mass, and that a behaviorally effective version of this was recently created. I also understand that while this matter pushes contrary to all acceleration it still naturally tends down toward the center of gravity, just like regular matter, because gravity pulls on weight, not mass, and the two are distinct. Please correct me if I've gone wrong.
Otherwise, I'll get to the meat of my question: I've read that mass does work into buoyancy. If that is the case, wouldn't negative mass released on earth still rise up like a lift gas, even if this was not true antigravity? Or have I become confused along the way?