HEU_ToolsUI._toolsInfo & HEU_ToolsUI._instanceInputUIState Can't be serialized if export as prefab.

[yebeans]

HEU_ToolsUI._toolsInfo is a scriptableobejct ,and CreateInstance when SetupAsset.
If export the HDA_Data parent node as a prefab, the HEU_ToolsUI._toolsInfo reference target can't be Serialized, the reference will be none when loaded the prefab and nowhere to initialize.

Same as HEU_ToolsUI._instanceInputUIState and other ScriptableObject Classes may be?
version 18.5.545