Before I suspected Vecna caused a lot of troubles when that time in Sigil, but now I am wondering if the D&D multiverse suffered a reboot and this even is link with Gord the rogue, a character created by Gary Gygax and than in the last novel....
And not eve the WotC can be really safe about the canon because later in the future Hasbro could ask some changes to allow some...."collabs and crossovers". It would be really funny to find the crashed fortnite bus as a piece of artrezzo in the VTT in April's Fool.