Too Competent No-No

Don't appear too competent: you will get more work.

Counter-intuitive to advancement? No - because the type of work you'll have dumped on you will be the busywork of superiors who will receive the credit for your efforts and wouldn't think of sharing that credit with you because it will show up the fact that they couldn't do it. It will not be the planned assignment, not the "I think you are the person to handle this responsibility." Nope, it will just appear on your desk, outside of your normal workflow, with the briefest of notes describing when it's due.

Lucky you. Too competent.