[Bug] Unity 2018.3.x is broken. I can't find the exact reason but something got broken

[Xtro]

The new bug after this one is fixed on 2018.3.6.

[Bug] Unity 2018.3.6 is still broken even after fixing a similar bug

This bug needs urgent attention. 2018.3.x series is still unusable! Bug report: https://fogbugz.unity3d.com/default.asp?1127913_q1qkru2jjcojc707 Issue tracker: QA team didn’t think this is a separate bug and they gave me the issue tracker link for the previous bug even thou my repro steps are different Unity Issue Tracker - Prefab instance management script loses references to the main objects in the scene after building and saving the project Very similar bug (fixed in 2018.3.6): [Bug] Unity…