Hi Don, the FreeRTOS kernel github repository allows you to see current status on any issues (bug reports, pull requests, etc). You should also take a look at history.txt to see what has changed since the version you are using. (The current release is 10.4.6.)
Don’t be too surprised not to find any known bugs or any that affect you. As you noted FreeRTOS is exceptionally reliable. It is well established and well tested. And when there are issues, the maintainers seem to prioritize fixes and get them out quickly.