The ball must be thrown directly onto the court (unless to another OOB teammate) and anything inbounds is part of the court, which includes five of the six sides of the backboard (only the back side is OOB), so there's no violation. It's really the same as if the pass hit one of the officials who was standing inbounds.
Unless someone digs up a case play from a bazillion years ago that says different.
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Yom HaShoah
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