I did consider the OST Awesome theme could have been an issue so I rolled back the front end folders to use the native OST front end with no modifications. Same behavior, same 403 in the browser dev tools, HOWEVER; I'm not convinced that's completely accurate anymore.
When following the site and apache2 error logs and generating the same behavior I don't see any messages thrown at all. My site error log doesn't show any errors since Friday the 11th and apache2 threw an unrelated issue at midnight last night.
I cleared browser cache and started over with a fresh login when I realized on a different task I wasn't getting the issue so it seems isolated to 1 particular task that may have been handled with a poor workflow. Unfortunately it seems I can't take control of the task or even delete it anymore. In short: if I open a different task the status(es) and due date calendar work fine so it appears to be 1 buggy task giving this behavior.