[BUG] Harandar's "Peculiar Cauldron" treasure unobtainable on alts - Flame-Hardened Sap of Teldrassil isn't spawning any longer

Hello. Basically what the title says - after you farm all 150 Crystalized Resin Fragments and open Peculiar Cauldron on one character, the treasure still shows up as available on other characters, but it’s the only one bugged and unavailable to open up again, since Flame-Hardened Sap of Teldrassil (container for Crystalized Resin Fragment) isn’t spawning anymore. Every other Midnight’s treasure (those with mounts included) can be opened on alts and they usually give Voidlight Marl or mount you can’t learn, because it’s already in your collection. Peculiar Cauldron is the only one messed up. Tried everything, contacted CS multiple times, sent multiple bug reports. Desperately looking for help here.

EDIT 21.05 - Will this ever get fixed? I’m trying every single day, sending multiple bug reports, and absolutely no response. I understand the player can’t learn the mount again and for 90% of the player base there is no point in doing it again on alt, but then why would make EVERY OTHER MIDNIGHT TREASURE repeatable (even the mount ones) on alts, and this one isn’t, yet still appearing in the world, huh? Come on, just do something about it, please.