Unregister custom SettingsRegistries in the test Teardown

Code/Tools/AssetBundler/tests/applicationManagerTests.cpp

@@ -101,6 +101,12 @@ namespace AssetBundler
             delete m_data->m_localFileIO;
             AZ::IO::FileIOBase::SetInstance(m_data->m_priorFileIO);
 
+            auto settingsRegistry = AZ::SettingsRegistry::Get();
+            if(settingsRegistry == &m_registry)
+            {
+                AZ::SettingsRegistry::Unregister(settingsRegistry);
+            }
+
             m_data->m_applicationManager->Stop();
             m_data->m_applicationManager.reset();
             m_data.reset();

Code/Tools/AssetBundler/tests/tests_main.cpp

@@ -118,7 +118,6 @@ namespace AssetBundler
             {
                 AZ::SettingsRegistry::Register(&m_registry);
                 registry = &m_registry;
-                
             }
             else
             {
@@ -157,6 +156,12 @@ namespace AssetBundler
             delete m_data->m_localFileIO;
             AZ::IO::FileIOBase::SetInstance(m_data->m_priorFileIO);
 
+            auto settingsRegistry = AZ::SettingsRegistry::Get();
+            if(settingsRegistry == &m_registry)
+            {
+                AZ::SettingsRegistry::Unregister(settingsRegistry);
+            }
+
             m_data->m_gemInfoList.set_capacity(0);
             m_data->m_gemSeedFilePairList.set_capacity(0);
             m_data->m_application.get()->Stop();

Code/Tools/AssetProcessor/native/tests/platformconfiguration/platformconfigurationtests.cpp

@@ -49,7 +49,7 @@ void PlatformConfigurationUnitTests::SetUp()
         + "/project_path";
     registry->Set(projectPathKey, "AutomatedTesting");
     AZ::SettingsRegistryMergeUtils::MergeSettingsToRegistry_AddRuntimeFilePaths(*registry);
-    
+
     using namespace AssetProcessor;
     m_qApp = new QCoreApplication(m_argc, m_argv);
     AssetProcessorTest::SetUp();
@@ -61,6 +61,12 @@ void PlatformConfigurationUnitTests::TearDown()
     AssetUtilities::ResetAssetRoot();
     delete m_qApp;
     AssetProcessor::AssetProcessorTest::TearDown();
+
+    auto settingsRegistry = AZ::SettingsRegistry::Get();
+    if(settingsRegistry == &m_registry)
+    {
+        AZ::SettingsRegistry::Unregister(settingsRegistry);
+    }
 }
 
 TEST_F(PlatformConfigurationUnitTests, TestFailReadConfigFile_BadPlatform)

Gems/LmbrCentral/Code/Tests/Builders/MaterialBuilderTests.cpp

@@ -71,6 +71,12 @@ protected:
 
     void TearDown() override
     {
+        auto settingsRegistry = AZ::SettingsRegistry::Get();
+        if(settingsRegistry == &m_registry)
+        {
+            AZ::SettingsRegistry::Unregister(settingsRegistry);
+        }
+
         AZ::Debug::TraceMessageBus::Handler::BusDisconnect();
         m_app->Stop();
         m_app.reset();