Freshness anomaly detection test false negative?

[gbatiz]

Path: /guides/anomaly-detection-tests/freshness-anomalies

I am not sure if this is a bug, or the docs aren't clear to me. When implementing a test, I always try to make it fail, before trusting it.

I am trying to fail the below freshness anomaly test:

version: 2
models:

- name: stg_erp_contracts

  config:
    alias: erp_contracts
    schema: staging_events
    elementary:
      timestamp_column: _META_LOADED_AT
  tests:
    - elementary.freshness_anomalies:
        severity: warn
        anomaly_sensitivity: 0.00001
        backfill_days: 2
        days_back: 28
        anomaly_direction: both
        time_bucket:
          period: day
          count: 1
        seasonality: day_of_week
        min_training_set_size: 14

And I am getting the below result. I don't understand why this test doesn't fail if every single point in time is a failure.