m0useanswered grow question 6 hours ago It might recover it might not, If it stays dead and dries out just cut the branch off, the plant will adapt.
If its looking like it might survive you can help it maintain moisture by wrapping a plastic bag aorund the site of injury. branch and all. They can sometimes encourage mold growth though so proceed at your own risk. Clones are often in a high RH environment with no issues but left long enough and it will get gross.