Excel documents are generating incorrect preview images

Issue Summary

Previewing an Excel file in Confluence and there are some parts that look slightly different in the Confluence preview vs the Excel preview. The example can be found in  https://product-fabric.atlassian.net/browse/MEX-1248

Steps to Reproduce

1. Create a Page in Confluence
2. Upload the example excel file in https://product-fabric.atlassian.net/browse/MEX-1248 to the page.
3. You can see the Confluence preview is different from the Excel Preview.
   1. Confluence preview:
      
   2. Excel Preview:
      

Expected Results

The Confluence preview is exact the same as the Excel Preview.

Actual Results

The Confluence preview is different from the Excel Preview

Workaround

Download the Excel file can open it to view the graph.