diff --git a/issues/Issue12964/Issue12964.csproj b/issues/Issue12964/Issue12964.csproj
new file mode 100644
index 000000000000..bcca18ce92ad
--- /dev/null
+++ b/issues/Issue12964/Issue12964.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="8.0.0" />
+    <ProjectReference Include="..\..\apis\Google.Cloud.PubSub.V1\Google.Cloud.PubSub.V1\Google.Cloud.PubSub.V1.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/issues/Issue12964/Issue12964.sln b/issues/Issue12964/Issue12964.sln
new file mode 100644
index 000000000000..8b9fa442d8a8
--- /dev/null
+++ b/issues/Issue12964/Issue12964.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.9.34728.123
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Issue12964", "Issue12964.csproj", "{41562B49-7518-423B-957D-876704FF3F85}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Google.Cloud.PubSub.V1", "..\..\apis\Google.Cloud.PubSub.V1\Google.Cloud.PubSub.V1\Google.Cloud.PubSub.V1.csproj", "{C7261A02-B28E-4457-A661-4C61BB000B28}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{41562B49-7518-423B-957D-876704FF3F85}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{41562B49-7518-423B-957D-876704FF3F85}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{41562B49-7518-423B-957D-876704FF3F85}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{41562B49-7518-423B-957D-876704FF3F85}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C7261A02-B28E-4457-A661-4C61BB000B28}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C7261A02-B28E-4457-A661-4C61BB000B28}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C7261A02-B28E-4457-A661-4C61BB000B28}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C7261A02-B28E-4457-A661-4C61BB000B28}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FDFAD55E-A2C5-4D70-9BB7-9A086622EC9F}
+	EndGlobalSection
+EndGlobal
diff --git a/issues/Issue12964/Program.cs b/issues/Issue12964/Program.cs
new file mode 100644
index 000000000000..7ed29ec367fb
--- /dev/null
+++ b/issues/Issue12964/Program.cs
@@ -0,0 +1,47 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License"):
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using Google.Cloud.PubSub.V1;
+using Microsoft.Extensions.Logging;
+
+if (args.Length != 2)
+{
+    Console.WriteLine("Arguments: <project-id> <subscription-id>");
+    return;
+}
+
+var loggerFactory = LoggerFactory.Create(builder => builder.AddSimpleConsole(options =>
+{
+    options.SingleLine = true;
+    options.TimestampFormat = "yyyy-MM-dd'T'HH:mm:ss.fff'Z '";
+    options.UseUtcTimestamp = true;
+}));
+
+var client = new SubscriberClientBuilder
+{
+    SubscriptionName = new SubscriptionName(args[0], args[1]),
+    Logger = loggerFactory.CreateLogger("Subscriber")
+}.Build();
+
+var handlerLogger = loggerFactory.CreateLogger("Handler");
+
+loggerFactory.CreateLogger("Timing").LogInformation("Starting subscriber");
+var task = client.StartAsync((message, cancellationToken) =>
+{
+    handlerLogger.LogInformation("Received message with text '{text}'. MessageID='{id}'",
+        message.Data.ToStringUtf8(), message.MessageId);
+    return Task.FromResult(SubscriberClient.Reply.Ack);
+});
+
+await task;