It is an accessibility issue; I think most people would agree to call it a bug. Creating a forum thread is less likely to get attention than reporting it as a bug to Fizzer, since bug reports go directly to Fizzer's inbox.
Could you go ahead and file a bug to Fizzer that just says "Draft Icon is not colorblindness-friendly. See thread https://www.warzone.com/Forum/538077
That way we can make sure Fizzer takes a look at the thread and knows about the issue. I hope it gets fixed, because it sounds like a real pain to have to try and find that invisible draft icon.