Update to Unity 2018.2.0x-ImprovedPrefabs breaks all references to prefabs

I have update my project from Unity 2018.1.1f1 to Unity 2018.2.0x Nested Prefabs and all existing references to prefabs were lost. Then I have created a new project in Unity 2018.1.1f1, write some test classes to have references to other objects/prefabs and after upgrade it to Unity 2018.2.0x Nested Prefabs result was the same. References to prefabs were lost.

 

I wouldn't be surprised -- the update to prefabs is a pretty big breaking change to the way prefabs work. While they might have some way to safely update your project in the future, it seems as though that isn't the case right now. I hope you kept a backup of your project.

 

Yes, I have a backup, but created this post to share my experience with other developers. Hope unity team will fix this issue in a 2018.3 build