3365227 - ABAP-based UI5 apps fail to be opened in "SAP Build Workzone, standard edition"

• Launching a SAPUI5 app exposed from an ABAP backend system in "SAP Build Work Zone, Standard Edition" shows a blank screen or busy indicator.
• The app works when executed in the ABAP backend's Fiori Launchpad.
• The console log of the browser´s developer tools shows errors such as:

https://ui5.sap.com/<1.UI5_version.UI5_patch>/resources/sap-ui-core.js net::ERR_ABORTED 404

or:

https://ui5.sap.com/<1.UI5_version.UI5_patch>/resources/sap/ushell_abap/bootstrap/appruntime-min-0.js net::ERR_ABORTED 404
https://ui5.sap.com/<1.UI5_version.UI5_patch>/resources/sap/ushell_abap/bootstrap/appruntime-min-1.js net::ERR_ABORTED 404
https://ui5.sap.com/<1.UI5_version.UI5_patch>/resources/sap/ushell_abap/bootstrap/appruntime-min-2.js net::ERR_ABORTED 404
https://ui5.sap.com/<1.UI5_version.UI5_patch>/resources/sap/ushell_abap/bootstrap/appruntime-min-3.js net::ERR_ABORTED 404

• SAP Build Work Zone, Standard Edition
• SAP S/4HANA onPremise

appruntime-min-0.js, appruntime-min-1.js, appruntime-min-2.js, appruntime-min-3.js, sap-ui-core.js, net::ERR_ABORTED 404, ui5appruntime.html, sapui5, outdated, cFLP, BTP launchpad, WZ, SAP Build Workzone, Fiori launchpad, SAP Mobile Start, SMP, content federation, federated , KBA , CA-FLP-ABA , SAP Fiori Launchpad ABAP Services , EP-WZ-BCI , Business Content DesignTime Visualization , EP-WZ-SM , Site Directory, Site Settings, Site Service, IAS Integration , CA-FLP-FE-COR , SAP Fiori Launchpad Frontend Core and Services , Problem