Why not? If you can bend space time into the bubble in the first place, why can't you bend it back? The main issue I've heard with 'popping' the bubble isn't

Why not? If you can bend space time into the bubble in the first place, why can't you bend it back? The main issue I've heard with 'popping' the bubble isn't that you cut yourself off from the rest of space permanently, it's that there's a collection of everything that would have been along your path time dilated sitting right at the edge of the bubble that flies into the bubble all at once and is pretty nasty for anything in the bubble.