The closest relevant result is the Google Docs Editors Community thread[1] where a user reports seeing only a black screen when trying to present slides. A Google employee responds with general troubleshooting advice but does not provide a clear solution.
Other results discuss slides not loading properly[2] or parts of slides not showing[3], but again do not provide definitive reasons or fixes for slides not displaying at all during a live presentation.
In summary, while the search results offer some helpful background information and troubleshooting suggestions for Google Slides, they fail to directly answer why a particular slide may not be showing up when presenting slides to an audience. More targeted troubleshooting would be needed to diagnose this specific presentation display issue.
