chore(main): release LaunchDarkly.ServerSdk 8.12.1

Author: github-actions[bot]

.release-please-manifest.json

@@ -2,7 +2,7 @@
   "pkgs/dotnet-server-sdk-consul": "5.0.0",
   "pkgs/dotnet-server-sdk-dynamodb": "5.0.0",
   "pkgs/dotnet-server-sdk-redis": "5.1.0",
-  "pkgs/sdk/server": "8.12.0",
+  "pkgs/sdk/server": "8.12.1",
   "pkgs/sdk/client": "5.7.1",
   "pkgs/telemetry": "1.4.0",
   "pkgs/sdk/server-ai": "0.9.3",

pkgs/sdk/server/CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [8.12.1](https://github.com/launchdarkly/dotnet-core/compare/LaunchDarkly.ServerSdk-v8.12.0...LaunchDarkly.ServerSdk-v8.12.1) (2026-05-12)
+
+
+### Bug Fixes
+
+* Honor x-ld-fd-fallback header in FDv2 initializer phase and on successful responses ([#251](https://github.com/launchdarkly/dotnet-core/issues/251)) ([4bb667d](https://github.com/launchdarkly/dotnet-core/commit/4bb667dc6ca7560a45c6b43cb2b02e2744a0f466))
+
 ## [8.12.0](https://github.com/launchdarkly/dotnet-core/compare/LaunchDarkly.ServerSdk-v8.11.2...LaunchDarkly.ServerSdk-v8.12.0) (2026-04-16)
 
 

pkgs/sdk/server/PROVENANCE.md

@@ -9,7 +9,7 @@ To verify build provenance attestations, we recommend using the [GitHub CLI `att
 <!-- x-release-please-start-version -->
 ```
 # Set the version of the SDK to verify
-SDK_VERSION=8.12.0
+SDK_VERSION=8.12.1
 ```
 <!-- x-release-please-end -->
 

pkgs/sdk/server/src/LaunchDarkly.ServerSdk.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <!--x-release-please-start-version-->
-    <Version>8.12.0</Version>
+    <Version>8.12.1</Version>
     <!--x-release-please-end-->
     <!-- The BUILDFRAMEWORKS variable allows us to override the target frameworks with a
          single framework that we are testing; this allows us to test with older SDK