Perf baselines

Ben CI is saying (on !3889) Missing Baseline Metrics these metrics trivially pass because a baseline (expected value) cannot be recovered from previous git commits. This may be due to HEAD having new tests or having expected changes, the presence of expected changes since the last run of the tests, and/or the latest test run being too old. T18223 T12425 T13253 Now it's true that T18223 is new, but T12425 and T13253 are not. What's wrong? Thanks Simon