Can't upload any file or view selected attachment using Office Document Viewer

Steps to reproduce:

1. Edit any page
2. Click on Insert > Other Macros
3. Search for Office Document Viewer macro
4. Click Select
5. Click on the drop down list under reference to upload an office file

Expected results: The user can select an office file to upload.

Actual results: The loading icon appears and errors in the browser console. The user can't upload the file.

Regression as it is working in XWiki 13.10.7 and 14.3

NOTE: If an office doc is attached to the page, when adding the Office Document Macro the user can select that doc if the drop down is clicked 2 times, but also in this case errors appear and the doc isn't shown in the page