Bug with transition (Rise of the Tomb Raider)

I am about to approach the final part of the game, and at the location the lost city from the bonfire "final line" made the transition to the Soviet base, now from here I again cannot return to the bonfire "final line" to continue the plot. At the stake, he writes that fast transition is not available. There is also nothing in the main menu of the game in the loading sections ((, I play on extreme survival difficulty. Help pliz.