Dude, let me tell you a little secret: saves actually work.
The main problem is that new content is also added in the first days of the game.
I'll explain:
For example, in the new update there is a task with Alice, but the quest with Lisa was added in the first days of the game, which is why your saving will not allow you to get new content with Lisa.
So, you need to use any save from the previous version (0.05). When the render appears with the text that the old saves are not working, click the Back button on the screen.
P.S.
In version 0.05, Max was supposed to visit Mia's house, but the developer got sick and now it will only appear in version 0.07. About the middle of Chapter 1.
This information means that throughout the development of Rebuild, each update receives a certain addition: continuation of the story + new quests and events at the beginning of the game.