Played rogue religiously from prepatch tbc until legion.
Cant comment on when this started. But it definitely wasnt around back when my class had positional requirments.
I first started running into it on private servers when cataclysm came out and i wanted to keep playing wotlk.
Its probably something in the base script that was fixed blizzard side for live, but not fixed for people just copying and pasting the game without their notes. Which is ironically what blizzard did with classic from what i heard. Like implementing clos being 60% down from 90% for a while in tbcc.
Just a guess.
And i dont mind the necro as its a recurring problem.