Has a FIBA World Cup game ever ended 84-79?
It has. 84-79 has been a FIBA World Cup final 3 times in 2,041 games. The first was Israel beat Uruguay on July 5, 1986; the latest was Qatar beat Iraq on July 2, 2018.
That makes 84-79 the 96th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 85-79 has happened 2 times and 84-80 has happened 3 times. At one point the score disappeared for 33 years, between 1986 and 2019.