As groups returned on the second day of Phase 3 to continue their raids and found that these two bosses weren't spawning, some reported this straight to WoW Classic Senior Game Producer Josh Greenfield himself.
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Players have reported that two of the bosses in the new Sunken Temple Level-Up Raid, Dreamscythe and Weaver, are not spawning. This seems to occur when a group clears the raid up to this duo, leaves the instance and then return at a later time.