Is there a way to go back to Vehicle build 24 ?

[Battosay]

Hey guys !    

So, a few weeks ago I came back to playing PZ when I heard about the vehicle test build, and I thought I would give a shot at Hydrocraft and try it too, so I started a world in Vehicle build 21. I kept on playing, and to my surprise my save was compatible with every build update up to Vehicle build 24, but today after I updated to Vehicle build 25, the game just crash after trying to convert my save. Here's the console report if it can help : https://pastebin.com/AFWYJkDr

So I tried to use the Previousvehicle branch, thinking that since it's Vehicle build 21 it would work with my save, who was made in V21, but sadly I can't load any save (https://i.imgur.com/hBdZc7P.jpg), even the one created by the game when he converted my save from V21 to the new format used in V23 or V24 :/

So I was wondering if any of you had a similar issue and knew of a workaround, of if there is a way to go back to Vehicle build 24 somehow ? I've become quite attached to my character and actually made it further than ever in this play-through, and I'd hate to lose it all like that