diff --git a/tools/test-proxy/Azure.Sdk.Tools.TestProxy/Common/ContentTypeUtilities.cs b/tools/test-proxy/Azure.Sdk.Tools.TestProxy/Common/ContentTypeUtilities.cs
index 0eb54dcd809..8a23a3f4b32 100644
--- a/tools/test-proxy/Azure.Sdk.Tools.TestProxy/Common/ContentTypeUtilities.cs
+++ b/tools/test-proxy/Azure.Sdk.Tools.TestProxy/Common/ContentTypeUtilities.cs
@@ -5,11 +5,21 @@
 
 using System;
 using System.Text;
+using Microsoft.AspNetCore.Razor.Language.Intermediate;
 
 namespace Azure.Sdk.Tools.TestProxy.Common
 {
     internal static class ContentTypeUtilities
     {
+
+        public static bool IsManifestContentType(string contentType)
+        {
+            const string dockerManifest = "application/vnd.docker.distribution.manifest.v";
+            const string dockerIndex = "application/vnd.oci.image.index.v";
+
+            return contentType.Contains(dockerManifest) || contentType.Contains(dockerIndex);
+        }
+
         public static bool TryGetTextEncoding(string contentType, out Encoding encoding)
         {
             const string charsetMarker = "; charset=";
@@ -22,8 +32,6 @@ public static bool TryGetTextEncoding(string contentType, out Encoding encoding)
 
             // Default is technically US-ASCII, but will default to UTF-8 which is a superset.
             const string appFormUrlEncoded = "application/x-www-form-urlencoded";
-            const string dockerManifest = "application/vnd.docker.distribution.manifest.v";
-            const string dockerIndex = "application/vnd.oci.image.index.v";
 
             if (contentType == null)
             {
@@ -50,7 +58,7 @@ public static bool TryGetTextEncoding(string contentType, out Encoding encoding)
                         contentType.EndsWith(urlEncodedSuffix, StringComparison.OrdinalIgnoreCase) ||
                         contentType.StartsWith(appJsonPrefix, StringComparison.OrdinalIgnoreCase) ||
                         contentType.StartsWith(appFormUrlEncoded, StringComparison.OrdinalIgnoreCase)
-                    ) && !contentType.Contains(dockerManifest) && !contentType.Contains(dockerIndex)
+                    ) && !ContentTypeUtilities.IsManifestContentType(contentType)
                 )
             {
                 encoding = Encoding.UTF8;
diff --git a/tools/test-proxy/Azure.Sdk.Tools.TestProxy/Common/RecordEntry.cs b/tools/test-proxy/Azure.Sdk.Tools.TestProxy/Common/RecordEntry.cs
index 8e35ee47974..235780323c0 100644
--- a/tools/test-proxy/Azure.Sdk.Tools.TestProxy/Common/RecordEntry.cs
+++ b/tools/test-proxy/Azure.Sdk.Tools.TestProxy/Common/RecordEntry.cs
@@ -126,7 +126,7 @@ private static void DeserializeBody(RequestOrResponse requestOrResponse, in Json
 
         public static void NormalizeJsonBody(RequestOrResponse requestOrResponse)
         {
-            if (requestOrResponse.TryGetContentType(out string contentType) && contentType.Contains("json"))
+            if (requestOrResponse.TryGetContentType(out string contentType) && contentType.Contains("json") && !ContentTypeUtilities.IsManifestContentType(contentType))
             {
                 try
                 {