'Graph is linked to private object(s) in an external package' problem while saving game

Development Programming & Scripting Blueprint
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Hi people,

I ran into the problem of having this ‘linked to private object(s) in an external place’ when saving, while I am saving game to slot in the ‘Construction Script’ part of an actor blueprint.

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However, if I were to bring all these nodes for saving to slot into the ‘Event Graph’ and link it ti Event Begin, it will work fine! Does anyone know why this happens? Is it a bug? Thank you.

Can’t save …/…/…/…/…/…/Users/Snooki/Documents/Unreal Projects/Test/Content/FirstPersonBP/Maps/FirstPersonExampleMap.umap: Graph is linked to private object(s) in an external package.
External Object(s):
BP_SaveInstance_C_4
/Engine/Transient

Try to find the chain of references to that object (may take some time)?

The asset ‘/Game/FirstPersonBP/Maps/FirstPersonExampleMap’ (FirstPersonExampleMap.umap) failed to save.

Cancel: Stop saving all assets and return to the editor.
Retry: Attempt to save the asset again.
Continue: Skip saving this asset only.