Blizzard has pushed a hotfix to Wrath Classic, addressing an issue with Beaming Earthsiege Diamond, allowing for instant mana generation when players swapped their meta in and out.
Here is the hotfix that went live today in Wrath Classic:
OCTOBER 31, 2022Wrath of the Lich King Classic
Fixed an issue where Beaming Earthsiege Diamond was also increasing current mana by 2% instead of only maximum mana.