Does anyone know anything about twins that share the same sac+placenta?

I’m 8w3d pregnant with twins that were sharing the same gestational sac and the same yolk sac. Unfortunately the baby farthest away from the yolk sac died at 6w6d.

Will this affect the other baby? Baby looked good, heartrate of 180. I can’t find any information about this type of twins, especially where one passes away so early.

I’m so worried.. please help.