3794190 - .save(...).done is not a function — AppState Internal API Returns Wrong Promise Type

Calling .done() on the result of .save() throws the error:
Plain TextTypeError: .save(...).done is not a function

SAP Fiori / SAP UI5 applications using inner app state persistence

Affects apps accessing AppState via internal APIs

SAP Fiori front-end server all versions ; SAP S/4HANA all versions

KBA , CA-FLP-FE-COR , SAP Fiori Launchpad Frontend Core and Services , Problem

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