I killed dolmen boss but did not get the gold skull nor event feather. Did get the chest to loot. I was not on the timer because I did not log in for more than 24 hours. Xbox NA server. Tried to open the ticket but did not hear back from support.
Thank you for the link to the article. I don't think it applies though. I was able to loot the boss, just no skull or feather dropped. I got it later on from running the delve, but just wanted to report the bug and see if anything can be done about it.