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Cloudrest weekly coffer is not properly curated
Greetings!
Few weeks ago I started doing weekly quests for this trial to fill my Set Collection. I was saving 1 weekly coffer to open them after I get all armor set pieces from bosses as drops, so that coffers would only reward unknown weapons to me. Sadly, these coffers are not 100% curated - sometimes I get new item from them, other times I get already known armor item

At first I thought that it happens if I open few coffers in a row (saved from previous weeks), although other trials have no such bug with their weekly coffers. But previous week I got the first weekly Cloudrest coffer on new character, opened it and got already known item again.
Screenshot from few weeks ago:

Screenshot from previous week (after Update 44 patch):

Collecting additional unknown set items from weekly coffers is major motivation for me to do a trial when there is no double drops event, so I would love this unpleasant bug to be fixed please.
Thank you!