I mention the cause in this post from the initial report, but I’ll let the team know the discrepancy in which difficulty is being displayed too
I’ll pass these on to the team but as the event has since ended I cannot unlock the Adventure again, but I can send the missed final rewards to your inboxes in the meantime, so keep an eye out.
Seems to only be affecting Sony consoles too, which I have notified the team of to investigate further.