Vegasaur can copy tracks and tracks'fx and marks. If tracks have been copy to nested timeline, the original track fx will transfer to the nested timeline reasonably.
Vegas Pro 17 only can create event nested timeline and creating event nested timeline will make marks disappear.
And that, I find the Vegas Pro 17's swithcing between the main project and nestedline is equal to that using menu "File-Open-project1" and "File-Open-project2". It just use a one-click to simplify "File-Open-project1" and "File-Open-project2". There is a great difference between VEGAS Pro17 and some other NLE like Premiere, Edius, AfterEffects and so on......