I can't increase the difficulty of the party

The difficulty of the dungeon cannot be increased in the Create Party.
Even if a party or a single player completes a dungeon on a selectable difficulty level, they cannot select the next difficulty level.
Dungeons that were selectable on X in 0.36 will still be selectable on X.
Please let me know if there is a way to increase the difficulty level.

I am also facing this issue in version The highest difficulty I can set is Difficulty I (Level 55) for any coop dungeon even after I have completed Difficulty X on all dungeons in solo. And yes, the goals show completed with a tick.

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