Has a FIBA World Cup game ever ended 90-59?
Exactly once. On February 24, 2019, China beat Syria 90-59, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 90-59 in league history.
That makes 90-59 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 91-59 has happened never and 90-60 has happened 2 times.