Editions Button Missing on bedrock homescreen for PS4 consoles with legacy edition disc

While trying to load legacy edition through the latest bedrock update, the editions Button was missing. I have the hard disc for legacy edition, but when I try to update it to its last own last update, it updates the entire game to bedrock, with no editions Button to switch between bedrock and legacy(I am am a regular bedrock player, but also played lots of legacy on ps3 before i switched to legscy ps4). To my knowledge there should be a Button on the bedrock homescreen to switch between the latest legacy update and bedrock