PrefabUtility.IsPartOfPrefabAsset is unreliable.

Title. PrefabUtility.IsPartOfPrefabAsset works fine when you are not editing a prefab, but as soon as you open up the prefab editor scene by double clicking on a prefab, the object magically returns false instead of true, despite it being part of a prefab that is being edited.

Any workaround?

Thanks.

Also: Not sure if this is the right section, might belong in the programming section instead. IDK.

 

The name of this API is a bit unfortunate and it's embarrassing the docs for this has not been clarified. I've created a bug case for this now. However, the the way the API works is by design. Prefab contents in Prefab Mode are loaded from a Prefab Asset, and upon saving, saved back to the Prefab Asset. But the contents is regular GameObjects.

There is (experimental) API to get the Prefab Stage a GameObject might be part of:
https://docs.unity3d.com/ScriptRefe...gement.PrefabStageUtility.GetPrefabStage.html
and then check if the object is part of the Prefab Contents in that stage:
https://docs.unity3d.com/ScriptRefe...ement.PrefabStage.IsPartOfPrefabContents.html

(Some technical issues have prevented us from moving this out of experimental for 2020.1 but we're working on it. It should be auto-upgraded once it's moved out of experimental.)