As no one has given you an answer: Ask Ubuntu is all about providing support for Ubuntu and its official derivatives by an army of volunteers (no we don't get paid for doing this) so everyone answers the questions they like and know something about.
There are a few things we do and don't do, but I suspect you never received an answer to your original question because no one uses mawk any more because there are better alternatives.
And why Canonical (the company behind Ubuntu) still ships mawk? We can only guess, and that is off-opic here... ;-)
So what can you do if mawk is that important to you?
Well, fix the bug yourself, hire a developer to do it for you and post the fix upstream, contact the developer, ... But definitely, go here!
#;-)