I have created an excel add-in using Office JS API and I am storing my worksheet's metadata with the worksheet id.
When I save my worksheet at that time my worksheet id is "{4BBBF664-CB10-44A3-9B15-B13CBACC4D9A}".
But when I reopen the Excel sheet again then my worksheet id is changed to "{00000000-0001-0000-0000-000000000000}".
It's working as expected on Office 365 and Office 2019.
This problem only happens in Excel 2016 standard version Build Version - (16.0.4266.1001) 64 bit