We have discovered that when using the green prefab save button (in the properties tab) and you press the close button in the scene view, then it will ask you if you want to “save the changes” -but changes should already have been saved?.
If you, however, press “save” in the scene view and then “close” afterwards, then the prompt does not appear (like this is the real save button).
We have also found out that not all properties in a prefab is saved when you press the save button. If you have a script attached with variables that can be changed in the properties tab then it seems that you have to manually drag the prefab from the node tree onto the ‘existing’ prefab thus overwriting it, before the changes are saved.
So we are not sure if this is a bug or if we should save prefabs in a different way?
Prefab save buttons in Creator
You are right. Prefab saving is a bit annoying.
This is indeed a bug, we will fix it. Thanks for the feedback!
I don’t quite get this one. All properties can be changed in ‘Properties Tab’, right?
Hi, sorry for not answering earlier (vacation)
Yes, you can change values in the properties tab for all the values “built into the editor” and they are saved correctly in the prefab.
But we have a custom script attached with variables that can be changed. If we change one of these variables in the Properties tab and Save the prefab, then the variable is still not saved. In order to save the changed variables we have to drag the prefab node from the Node tree tab into where the prefab is placed in the Assets tab.
Hope it makes sense 
Just tested this again and it actually seems to be fixed in v. 1.1.2,
