It usually doesn't, no. I'm not exactly sure of the details, but because the nerves that control the bladder and bowels are so low on the spine, almost every SB kid will have issues with that. I don't know if it's because that location makes them easily damaged, if it's just because they are usually the first damaged, if it's that any damage above that point causes the issues, or something else (and the good that the current surgeries do for the paralysis is by preventing further damage to the nerves that would normally occur between surgery date and birth).

If this actually repairs the nerves, I wonder if that's true in reverse (so bladder/bowel would be least likely/last to be fixed) or if they might have cases where bladder/bowel issues don't occur, but you still get paralysis. I don't know enough to predict it at all, just wildly speculating and curious there.