Starting island bug (Far Cry 6)

After completing the last mission with the capture of two ships, I was transported to the next island. There I had to go further, but instead I teleported back to the previous island. But the problem is that I cannot return from this island and continue playing the game, pressing F to teleport me, writes that this function is not available, trying to get by swimming sharks devour me, there is no water transport on the first island, what should I do?