Game crashes permanently when I try to enter the Nether portal

Hi! There is a big problem connected with minecraft bedrock edition beta on Windows 10. I started my survival in version 1.16.0.55 before adding a new nether world stuff in version 1.16.0.57. After switching to a new version, when I try to enter the nether world portal, game permanently crashes. I think this problem exactly connected with new nether generation features. I tried all: building portal in air, underground, building it for far distances from my home, rotating it in different directions, deleting and installing again, but entering portal still crashes the game. I even tried to find the way to delete nether files, but it seems that it is impossible to do this on bedrock edition.