VELAN E. answered 12/30/22
As we know that positive mass of black hole almost puncture the space time, breaking the quantum elasticity of space time fabric. And the negative mass at other side should be strong enough to warp the space time. So we need extreme mass to puncture the space time, which we need more quantum equations to measure it, and the net mass of worm hole will be zero, as positive mass and negative mass are acting.