diff --git a/eng/Packages.Data.props b/eng/Packages.Data.props
index 0c8a50a447f33..88b34e60674f6 100644
--- a/eng/Packages.Data.props
+++ b/eng/Packages.Data.props
@@ -222,7 +222,7 @@
     All should have PrivateAssets="All" set so they don't become package dependencies
   -->
   <ItemGroup>
-    <PackageReference Update="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20240613.2" PrivateAssets="All" />
+    <PackageReference Update="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20240614.3" PrivateAssets="All" />
     <PackageReference Update="Azure.ClientSdk.Analyzers" Version="0.1.1-dev.20240429.1" PrivateAssets="All" />
     <PackageReference Update="coverlet.collector" Version="3.2.0" PrivateAssets="All" />
     <PackageReference Update="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0" PrivateAssets="All" />
diff --git a/eng/emitter-package-lock.json b/eng/emitter-package-lock.json
index 4a17f3d984300..d60c1dd4b8c32 100644
--- a/eng/emitter-package-lock.json
+++ b/eng/emitter-package-lock.json
@@ -5,10 +5,10 @@
   "packages": {
     "": {
       "dependencies": {
-        "@azure-tools/typespec-csharp": "0.2.0-beta.20240613.2"
+        "@azure-tools/typespec-csharp": "0.2.0-beta.20240614.3"
       },
       "devDependencies": {
-        "@azure-tools/typespec-autorest": ">=0.42.1 <1.0.0",
+        "@azure-tools/typespec-autorest": "0.42.1",
         "@azure-tools/typespec-azure-core": "0.42.0",
         "@azure-tools/typespec-azure-resource-manager": "0.42.1",
         "@azure-tools/typespec-azure-rulesets": "0.42.1",
@@ -21,9 +21,9 @@
       }
     },
     "node_modules/@autorest/csharp": {
-      "version": "3.0.0-beta.20240613.2",
-      "resolved": "https://registry.npmjs.org/@autorest/csharp/-/csharp-3.0.0-beta.20240613.2.tgz",
-      "integrity": "sha512-RbQBaFctXNNPgSd1rvHLggdQ+kzs1BTTM14wqMpxVPIXISHONq5UHk+7DK/DvBWyAh+yXPnE/csGkZUGDWUyeQ=="
+      "version": "3.0.0-beta.20240614.3",
+      "resolved": "https://registry.npmjs.org/@autorest/csharp/-/csharp-3.0.0-beta.20240614.3.tgz",
+      "integrity": "sha512-NGkMgYyUB9CD8hvqlKQQTEX5tNHU8/1QFO/Q6CNmk/0aUUjQg+lDAK/SwO2ewdEluFoDFIM0zrvMvcZ6T+41qA=="
     },
     "node_modules/@azure-tools/typespec-autorest": {
       "version": "0.42.1",
@@ -115,11 +115,11 @@
       }
     },
     "node_modules/@azure-tools/typespec-csharp": {
-      "version": "0.2.0-beta.20240613.2",
-      "resolved": "https://registry.npmjs.org/@azure-tools/typespec-csharp/-/typespec-csharp-0.2.0-beta.20240613.2.tgz",
-      "integrity": "sha512-+fMROsKJLByDmS1gWRUDJYQBDiod8tq2KBlNPk6SF8E9FBTSkUqeFoTWMe53U/Dpm6mhZD7nk9S79/ElI9KHWA==",
+      "version": "0.2.0-beta.20240614.3",
+      "resolved": "https://registry.npmjs.org/@azure-tools/typespec-csharp/-/typespec-csharp-0.2.0-beta.20240614.3.tgz",
+      "integrity": "sha512-zpDKPgoaNShHfK9ywBfgE1MbNy/DulM9emELl4ZjEZXG64OAWxDlzMrdS6Hh8iI/mGt6beSCpq0/IbeN9Z6ZPw==",
       "dependencies": {
-        "@autorest/csharp": "3.0.0-beta.20240613.2",
+        "@autorest/csharp": "3.0.0-beta.20240614.3",
         "json-serialize-refs": "0.1.0-0"
       },
       "peerDependencies": {
diff --git a/eng/emitter-package.json b/eng/emitter-package.json
index 8b14887ff2a6c..cd194a1c719ee 100644
--- a/eng/emitter-package.json
+++ b/eng/emitter-package.json
@@ -1,10 +1,10 @@
 {
   "main": "dist/src/index.js",
   "dependencies": {
-    "@azure-tools/typespec-csharp": "0.2.0-beta.20240613.2"
+    "@azure-tools/typespec-csharp": "0.2.0-beta.20240614.3"
   },
   "devDependencies": {
-    "@azure-tools/typespec-autorest": ">=0.42.1 <1.0.0",
+    "@azure-tools/typespec-autorest": "0.42.1",
     "@azure-tools/typespec-azure-core": "0.42.0",
     "@azure-tools/typespec-azure-resource-manager": "0.42.1",
     "@azure-tools/typespec-azure-rulesets": "0.42.1",
diff --git a/sdk/devcenter/Azure.ResourceManager.DevCenter/src/Generated/Models/DevCenterOperationStatus.Serialization.cs b/sdk/devcenter/Azure.ResourceManager.DevCenter/src/Generated/Models/DevCenterOperationStatus.Serialization.cs
index 7088a9f774767..32d88a9919b8f 100644
--- a/sdk/devcenter/Azure.ResourceManager.DevCenter/src/Generated/Models/DevCenterOperationStatus.Serialization.cs
+++ b/sdk/devcenter/Azure.ResourceManager.DevCenter/src/Generated/Models/DevCenterOperationStatus.Serialization.cs
@@ -58,18 +58,39 @@ void IJsonModel<DevCenterOperationStatus>.Write(Utf8JsonWriter writer, ModelRead
             writer.WriteStringValue(Status);
             if (Optional.IsDefined(PercentComplete))
             {
-                writer.WritePropertyName("percentComplete"u8);
-                writer.WriteNumberValue(PercentComplete.Value);
+                if (PercentComplete != null)
+                {
+                    writer.WritePropertyName("percentComplete"u8);
+                    writer.WriteNumberValue(PercentComplete.Value);
+                }
+                else
+                {
+                    writer.WriteNull("percentComplete");
+                }
             }
             if (Optional.IsDefined(StartOn))
             {
-                writer.WritePropertyName("startTime"u8);
-                writer.WriteStringValue(StartOn.Value, "O");
+                if (StartOn != null)
+                {
+                    writer.WritePropertyName("startTime"u8);
+                    writer.WriteStringValue(StartOn.Value, "O");
+                }
+                else
+                {
+                    writer.WriteNull("startTime");
+                }
             }
             if (Optional.IsDefined(EndOn))
             {
-                writer.WritePropertyName("endTime"u8);
-                writer.WriteStringValue(EndOn.Value, "O");
+                if (EndOn != null)
+                {
+                    writer.WritePropertyName("endTime"u8);
+                    writer.WriteStringValue(EndOn.Value, "O");
+                }
+                else
+                {
+                    writer.WriteNull("endTime");
+                }
             }
             if (Optional.IsCollectionDefined(Operations))
             {
@@ -184,6 +205,7 @@ internal static DevCenterOperationStatus DeserializeDevCenterOperationStatus(Jso
                 {
                     if (property.Value.ValueKind == JsonValueKind.Null)
                     {
+                        percentComplete = null;
                         continue;
                     }
                     percentComplete = property.Value.GetSingle();
@@ -193,6 +215,7 @@ internal static DevCenterOperationStatus DeserializeDevCenterOperationStatus(Jso
                 {
                     if (property.Value.ValueKind == JsonValueKind.Null)
                     {
+                        startTime = null;
                         continue;
                     }
                     startTime = property.Value.GetDateTimeOffset("O");
@@ -202,6 +225,7 @@ internal static DevCenterOperationStatus DeserializeDevCenterOperationStatus(Jso
                 {
                     if (property.Value.ValueKind == JsonValueKind.Null)
                     {
+                        endTime = null;
                         continue;
                     }
                     endTime = property.Value.GetDateTimeOffset("O");
diff --git a/sdk/redis/Azure.ResourceManager.Redis/src/Generated/Models/RedisOperationStatus.Serialization.cs b/sdk/redis/Azure.ResourceManager.Redis/src/Generated/Models/RedisOperationStatus.Serialization.cs
index b21789c5a06f2..28293a1ed5f46 100644
--- a/sdk/redis/Azure.ResourceManager.Redis/src/Generated/Models/RedisOperationStatus.Serialization.cs
+++ b/sdk/redis/Azure.ResourceManager.Redis/src/Generated/Models/RedisOperationStatus.Serialization.cs
@@ -66,18 +66,39 @@ void IJsonModel<RedisOperationStatus>.Write(Utf8JsonWriter writer, ModelReaderWr
             writer.WriteStringValue(Status);
             if (Optional.IsDefined(PercentComplete))
             {
-                writer.WritePropertyName("percentComplete"u8);
-                writer.WriteNumberValue(PercentComplete.Value);
+                if (PercentComplete != null)
+                {
+                    writer.WritePropertyName("percentComplete"u8);
+                    writer.WriteNumberValue(PercentComplete.Value);
+                }
+                else
+                {
+                    writer.WriteNull("percentComplete");
+                }
             }
             if (Optional.IsDefined(StartOn))
             {
-                writer.WritePropertyName("startTime"u8);
-                writer.WriteStringValue(StartOn.Value, "O");
+                if (StartOn != null)
+                {
+                    writer.WritePropertyName("startTime"u8);
+                    writer.WriteStringValue(StartOn.Value, "O");
+                }
+                else
+                {
+                    writer.WriteNull("startTime");
+                }
             }
             if (Optional.IsDefined(EndOn))
             {
-                writer.WritePropertyName("endTime"u8);
-                writer.WriteStringValue(EndOn.Value, "O");
+                if (EndOn != null)
+                {
+                    writer.WritePropertyName("endTime"u8);
+                    writer.WriteStringValue(EndOn.Value, "O");
+                }
+                else
+                {
+                    writer.WriteNull("endTime");
+                }
             }
             if (Optional.IsCollectionDefined(Operations))
             {
@@ -194,6 +215,7 @@ internal static RedisOperationStatus DeserializeRedisOperationStatus(JsonElement
                 {
                     if (property.Value.ValueKind == JsonValueKind.Null)
                     {
+                        percentComplete = null;
                         continue;
                     }
                     percentComplete = property.Value.GetSingle();
@@ -203,6 +225,7 @@ internal static RedisOperationStatus DeserializeRedisOperationStatus(JsonElement
                 {
                     if (property.Value.ValueKind == JsonValueKind.Null)
                     {
+                        startTime = null;
                         continue;
                     }
                     startTime = property.Value.GetDateTimeOffset("O");
@@ -212,6 +235,7 @@ internal static RedisOperationStatus DeserializeRedisOperationStatus(JsonElement
                 {
                     if (property.Value.ValueKind == JsonValueKind.Null)
                     {
+                        endTime = null;
                         continue;
                     }
                     endTime = property.Value.GetDateTimeOffset("O");