Unable to Start a Dungeon Run

When I enter the Dungeon Run mode, it always says that I’ve beaten all 8 bosses and can now start the new trial. But when I press the only active button “Back” and enter Dungeon Run again, the situation repeats. Other runs could be started normally.

Attaching video report: youtu.be/J9bmJbVc4i8

Posting link without schema still works. And Google Chrome, if select the link, offers you to follow it in the context (right-click) menu.