TheDon79

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I could get a simple testfile showing the problem. [issue1191.xlsx](https://github.com/ClosedXML/ClosedXML/files/3107466/issue1191.xlsx)

I had to clear the apps data stored in the browser with the DEV tools. It happens because of the Edgio retirement. See [azureedge ](https://learn.microsoft.com/en-us/azure/cdn/edgio-retirement-faq).