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Until recently comma CCO pulsars comma with weak dipole B-fields and small spin-down rates comma were defined as stable rotators. Now comma long-term timing of 1E 1207.4-5209 revealed unexpected timing glitches and-or strong timing noise comma unprecedented for a pulsar with such small spin-down rates comma and has profound implications for the B-field evolution of CCOs and their emission mechanismopenParsclosePar. It may support a timely conjecture that glitches could be triggered in CCOs by diffusion of a strong comma buried internal field that rivals those found in magnetars. We now have evidence of similar timing behaviour from the CCO PSR J0821-4300 in Puppis A. We propose to monitor PSR J0821 4300 to resolve the nature of its timing anomaly comma possible new evidence of magnetic field growth on a CCO.