avoid modifying blobless collection during iteration in edge case #6168
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The fallback when blobless quarantine contains a block with all blobs modifies collection while iterating, potentially asserting if reachable. Using a second loop to process this situation resolves that.
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The fallback when blobless quarantine contains a block with all blobs modifies collection while iterating, potentially asserting if reachable. Using a second loop to process this situation resolves that.