If you read the linked topic, it explains that you are meant to construct a minimal repro file and add it to the topic. If the issue does not occur 100% of the time, you could include a more accurate percentage, this will help staff reproduce the issue and fix it. (i.e. add a repro file and add “this happens 1 / 10 times when I run the code”)
If the issue doesn’t reproduce reliably and it happens very infrequently then this might not be the time to file a bug report. You should always be wrapping your Async calls in pcall and dealing with errors gracefully, by the way.