That being part of the damage ,it should have been repaired properly, and if the body man says that`s as good as they can do then they should have communicated that to the insurance company and that could have gotten you a new bumper . Since the objective was to repair to a pre loss state, and that crack happened during the accident, I`d say the repair needs to be re done then because a pre loss state = no visible crack\tear on bumper.
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