We're dealing with the nefarious issue of instances losing their references to things in the parent prefab. For example property X has a value of Y. In the prefab the value Y exists, but is null in the instance in the scene. These break our game daily, and the answer is usually 'reimport all'. I have seen posts stating that this is fixed in our current Unity version of 2018.3.12. Are there more of these issues that exist that haven't been fixed? Or fixed in a newer version and we haven't seen it in the release notes? Also I realize that you may want a repro, but unfortunately I can't give you one. Its just intermittent enough to waste hours of time chasing bugs, but not reliable enough to send you a repro. The repro we are seeing equates to something like User A touches a prefab and commits their work. User B pulls latest from version control and refreshes and instances are lost. We also have serious issues with our build servers randomly losing instances and the answer is 'keep kicking the build'.