In actual practice, the ball must touch something on the other side, because outfielders can legally reach over and bring back a ball for an out if it is still in flight. The rule isn't that precise in the wording, however.
The secondary part is that an illegal act (fan interference or detached player equipment) that prevents the home run should be awarded (and treated the same) as a home run.
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Steve
ASA/ISF/NCAA/NFHS/PGF
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