As a result of today’s 1.0.4 patch, drop rates on ultra-rare Uniques were mistakenly increased as a reward from Helltide Chests. In order to correct these drop rates, the development team has decided to temporarily disable the ability for these Unique items to drop.
Harlequin Crest Drops from Helltide Chest Diablo 4 Patch 1.0.4 Notes
Blizzard
We have temporarily disabled Uber Uniques from dropping in-game while we address an issue with Helltide Chest drops.