Resolve 16 delivers a corrupt file.

I am working on a video project. I delivered this project multiple times before in .mov and H.264 codec and the video would play as expected. I recently added subtitles and now when I deliver my project, the file says it is corrupt/ not compatible, however I did not change my export settings. Is this some sort of bug with the subtitles? What can I do to troubleshoot this?

A system restart resolved this issue.