You're trying to use deeplink navigation within the offline mode of SAP Cloud For Customer extended app, but it doesn't work as it does while online.
SAP Cloud For Customer
This feature is not supported in the current release of SAP Cloud for Customer.
Check the SAP Cloud for Customer Ideas Forum to submit an idea: https://influence.sap.com/SAPCloudforCustomer
Deeplink; Mobile; Offline; Android; iOS; iPhone; Extended App; , KBA , AP-RC-MOB-CTN-AND , Android Container: Cloud for Customer Hybrid , How To