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The empty-segment skip in normalizeUri (introduced in round 1 fix) was stripping trailing slashes from canonical URIs, e.g. /bucket/ became /bucket. The AWS SDK signs with the trailing slash intact, so signatures never matched for any S3 operation with a body. The fix: only skip '.' segments (dot-segment removal per RFC 3986), preserve all other segments including empty ones from trailing slashes and double slashes. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>