Indeed, prefab “Auto-Save” does not work well with FC (or NC). The reason for that is because I opted to have it possible to Undo viewport panning for a better user experience (if undoing without viewport undo it is not clear what has been undoed). However, in prefab mode and auto-save, Unity seems to take a while (ms wise) to actually register the undos and especially save the prefab. As a result the viewport snaps back to the previous position after saving is done by unity because of the delay it has. Personally and most people I know basically have “Auto-Save” disabled since Unity will ask you to save the changes anyway as soon as you exit prefab edit mode. If that is a problem for you I might re-consider removing the Undo from viewport panning. However Unity will still be very slow at any other change made in FC which it will try to automatically save.
Gavalakis
