Problems with Sekiro (Sekiro: Shadows Die Twice)

Killed Filin, took the task at Kuro - to get the tears of the dragon. He got it, but when Kuro returned, and a dead Issin appeared instead, and Emma sat next to him, saying that Kuro was in a silver field, but getting there was nothing. Why? Because all the idols do not work, and on foot it is also impossible to reach the Reservoir as of Asina, as all the doors are closed. They are indeed closed, as there is one activated idol "The entrance of an abandoned dungeon" (or as it is there), but the doors cannot be opened