600 hits combined while spamming Find Minerals to stay on the Global Cooldown, 0 procs (at a 10% and 15% proc chance respectively). Those tests were done on the PTR, but since the patch was made live there’s been confirmation from Viscidus logs that GCD-blocking is still enabled for Frost Oil.
Nobody knows if this is intentional or not due to the wording of the 1.13.6 patch notes:
- Many items such as Hammer of Northern Wind, Sulfuras, Hand of Ragnaros, and Nightfall may now proc while the wielder is under the effects of a Global Cooldown.