What happens if nail malfunctions?

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If the Precice or Stryde nail malfunctions and refuses to lengthen, would they change the nail and continue with the old osteotomy or would they do a new osteotomy? Is it a very difficult surgery?

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If it's not lengthening because of preconsolidation will they rebreak in the same place or a new place? I don't know how they can break through soft callus.

If it is due to magnet failure, they just replace the nail? Won't it still mess up the osteotomy site?

Thanks

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I guess the only question that remains is whether another new osteotomy is done or the old one is re-opened.