Thanks for reply!
In my opinion it's not a great bug, after it's defined as known behavior and not a wrong operation by my side
![Smile :)](./images/smilies/icon_smile.gif)
Coming back to switching session, I simply tried all the types You listed in Your post.
So, I don't know if I must do something before/after that commands, now I can only say that in a live mode and executing the indicated steps, nothing happens and any DE doesn't start.
![Sad :(](./images/smilies/icon_sad.gif)