1.4 saves cannot be used in 2.0. This has been mentioned multiple times prior to 2.0 release and was even in the news section within the game itself. This game is still being developed, so this is to be expected. You can expect to need to start a new save for the other major update (3.0 and 4.0) as well. Minor updates shouldn't need a new save.
Q: How do I play the V2.0 Storms Brewing update on console?
A: V2.0 Storms Brewing is currently experimental. While experimental, it is only available to PC players that opt into the experimental build. Once it reaches stable status, everyone on PC and consoles will download it automatically. So you won’t need to do anything special to get it.
Q: Can I continue my V1.4 game on V2.0?
A: No. With V2.0 installed, you will not be able to play any saved games started on V1.0-V1.4.
Q: After I update to V2.0, can I return to V1.4 to continue my V1.4 game...