Okay, I'm not reading 15 pages of posts from people who didn't know what was up with the test build. I guess the game is still finding new people, because I really thought that after this happened last time, people would understand how this works this time around.
Maybe this was explained, but again, I ain't reading 15 pages of this to find out. So, here's how it works.
He builds the game forward. He only needs the latest chapter tested, because they rest was already tested in the past. So the test build is only designed to let you play the NEW chapter. That's why it is the way it is. You can't start a new game with the test build. You couldn't last time, and I expect it to be the same every time. You either start from your save at the end of the previous chapter, or you wait for the full release. Those are your options. Trying to frankenstein it together MIGHT work, but it would be easier to just play the old version to the end, then move your save over, rather than try to combine the old build with the test build.