[Known Build Error] Invalid digest failures in Containers.UnitTests #53918

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1381231

Build error leg or test failing:

1. Microsoft.NET.Build.Containers.UnitTests.RegistryTests.DownloadBlobAsync_RetriesOnFailure
2. Microsoft.NET.Build.Containers.UnitTests.ContentStoreTests.PathForDescriptor_RejectsInvalidDigest
3. Microsoft.NET.Build.Containers.UnitTests.RegistryTests.DownloadBlobAsync_ThrowsAfterMaxRetries

Pull request: #53905

This looks to be a regression introduced in #53724. The PR validation was run at a time when there was a test outage so it did not catch these failures.

Error Message

System.ArgumentException : Invalid digest: sha256:testdigest1234 (Parameter 'Digest')

{
  "ErrorMessage": "Invalid digest:",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1381231
Error message validated: [Invalid digest:]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/16/2026 1:47:35 PM UTC

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