Is the testimony of a non-heir concerning an injury admissible if the heir apparent is shielded (mahjub)?

Primary text

If a person who cannot inherit the injured party testifies about the injury, such as two full brothers testifying on behalf of their brother who has a son, their testimony is heard. If the son (the heir apparent) dies after the testimony but before the ruling, the judgment is final and not overturned if the judge ruled based on the testimony. If the son's potential succession arises before the ruling, the testimony is not acted upon because the witnesses subsequently become entitled parties, invalidating their testimony, analogous to a witness becoming a transgressor (fasīq) before judgment is passed upon their testimony.