Replaced a bunch of UnityEditor.EditorUtility.SetDirty with UnityEditor.PrefabUtility.SavePrefabAsset in DoPrepare
Do I understand why? No.
Do the docs explain why? Also, no.
Does it fix the bug? Seems to.
Monument markers fall back to root game object name when phrase is not set
Added assets/bundled/prefabs/modding/monument_marker.prefab for custom map monument markers (displayed name is taken from the PrefabData "category" string)