So Blizz says it’s intended… yay. But is this really in the spirit of the game? Some changes were made that fixed such “not-a-bugs”.
Anyway… How far does it extend? Is it only weapon procs? Crusader procs? HoJ procs?
You mean the stuff about how magic GCDs prevents procs?
It’s intended, yeah. Pservers got it wrong.
Any GCD from non-magical abilities doesn’t prevent procs, just to be clear. So basically, paladins with nightfall are kinda screwed. Shamans with nightfall are fine though, thanks to windfury. It’s just that it can’t proc while the GCD is up from using shocks etc., but windfury provides quite a lot of attacks outside of GCDs as well anyway.
Paladins should be playing a real spec instead. 
https://classic.wowhead.com/news=317112/blizzard-on-proc-effects-and-the-gcd-in-wow-classic
Greetings!
The team took another comprehensive look at Nightfall and other similar proc-based weapon and item effects with this new information and we can confirm that certain effects cannot proc while under the effects of the Global Cooldown triggered by certain abilities. However, after extensive testing in the reference client, we can also confirm that this is true and accurate to original World of Warcraft as well.
We also discovered that there were specific provisions built into the original game to force this to be true. However, we discovered that this is true only if the spell or ability that triggered the GCD was flagged as a magic-based attack (or more specifically, spells flagged in our data with a defense category of “magical”).
This means that most physical abilities or spells that incur the GCD will not block these procs from firing while the GCD is in effect. An example of this is a Warrior’s Hamstring ability. This has a defense category of “physical”, thus you can still see Nightfall procs occur while you are on GCD following the usage of Hamstring. Alternatively, Demoralizing Shout has a defense category of “magical” and you will not see Nightfall or certain other items proc during the GCD immediately following that spell’s usage.
At this point it’s somewhat unclear if this was the original design intent or not, but at worst this was a quirk of how the original game was built, and at best this was part of the original design. Either way, this is not something that we currently consider to be a bug.
Thank you for the post about this, Smeet. Thank you as well to all of the other players who contributed to the super diligent research on this topic. We were glad to be able to revisit this and help clarify some of the inconsistencies players were experiencing around this and other proc-based items.
So basically, they don’t specify exactly what kind of procs are blocked by magical GCDs. Just that it’s “certain effects”. The testers went through quite a bit though, if you want specifics.
That’s simply not true. The latest update from Aggrend on the US forums clearly states that their first claim about magical abilities was wrong, and that some items won’t proc during the gcd triggered by any abilities.
It’s obviously intended though, since the original devs appears to have flagged these items to not proc.
Ah, well my bad then. Don’t really read the US forum all that much, nor see why I should need to and don’t really see why you do either.
Yeah well, the essential point of what I posted is just that. That it’s intended behavior, without a doubt. So all you can do is just learn to live with it, and stop using pservers as reference.
There are many players who had, and some still do, blind faith in pservers and their messing around to guess the blanks of what they couldn’t find properly. It’s best to dispel that illusion.
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