Eerie Mojang Party - the first daily challenge does not give reward (Mojang Office Cap)

It seems like the first daily challenge no longer gives a reward even though it is marked as completed. Dozens of game restarts and revisiting departments did not solve the bug and the Mojang Office Cap is not displayed in the dressing room

 

Update: the event ended and the bug was never fixed, so it is now impossible to get the hat from the server