diff --git a/.github/actions/spelling/expect/expect.txt b/.github/actions/spelling/expect/expect.txt
index b2961cb7f3..8c1e4ab6c3 100644
--- a/.github/actions/spelling/expect/expect.txt
+++ b/.github/actions/spelling/expect/expect.txt
@@ -141,6 +141,7 @@ BValue
 Cacafire
 CALLCONV
 CANDRABINDU
+CANTCALLOUT
 capslock
 CARETBLINKINGENABLED
 CARRIAGERETURN
@@ -808,6 +809,7 @@ INCONTEXT
 INDEXID
 INFOEX
 inheritcursor
+ININPUTSYNCCALL
 INITCOMMONCONTROLSEX
 INITDIALOG
 INITGUID
diff --git a/src/cascadia/TerminalApp/AppLogic.cpp b/src/cascadia/TerminalApp/AppLogic.cpp
index 9fdec92368..f601ec8cf1 100644
--- a/src/cascadia/TerminalApp/AppLogic.cpp
+++ b/src/cascadia/TerminalApp/AppLogic.cpp
@@ -149,7 +149,9 @@ namespace winrt::TerminalApp::implementation
             });
 
         _languageProfileNotifier = winrt::make_self<LanguageProfileNotifier>([this]() {
-            _reloadSettings->Run();
+            // TODO: This is really bad, because we reset any current user customizations.
+            // See GH#11522.
+            ReloadSettingsThrottled();
         });
 
         // Do this here, rather than at the top of main. This will prevent us from
@@ -329,7 +331,7 @@ namespace winrt::TerminalApp::implementation
 
                 if (modifiedBasename == settingsBasename)
                 {
-                    _reloadSettings->Run();
+                    ReloadSettingsThrottled();
                 }
             });
     }
@@ -435,6 +437,11 @@ namespace winrt::TerminalApp::implementation
         SettingsChanged.raise(*this, *ev);
     }
 
+    void AppLogic::ReloadSettingsThrottled()
+    {
+        _reloadSettings->Run();
+    }
+
     // This is a continuation of AppLogic::Create() and includes the more expensive parts.
     void AppLogic::NotifyRootInitialized()
     {
diff --git a/src/cascadia/TerminalApp/AppLogic.h b/src/cascadia/TerminalApp/AppLogic.h
index f992561632..2b5a467f85 100644
--- a/src/cascadia/TerminalApp/AppLogic.h
+++ b/src/cascadia/TerminalApp/AppLogic.h
@@ -36,6 +36,7 @@ namespace winrt::TerminalApp::implementation
         bool IsRunningElevated() const noexcept;
         bool CanDragDrop() const noexcept;
         void ReloadSettings();
+        void ReloadSettingsThrottled();
         void NotifyRootInitialized();
 
         bool HasSettingsStartupActions() const noexcept;
@@ -80,7 +81,6 @@ namespace winrt::TerminalApp::implementation
         [[nodiscard]] HRESULT _TryLoadSettings() noexcept;
         void _ProcessLazySettingsChanges();
         void _RegisterSettingsChange();
-        safe_void_coroutine _DispatchReloadSettings();
 
         void _setupFolderPathEnvVar();
 
diff --git a/src/cascadia/TerminalApp/AppLogic.idl b/src/cascadia/TerminalApp/AppLogic.idl
index 4f6bc262c3..eee6c311a0 100644
--- a/src/cascadia/TerminalApp/AppLogic.idl
+++ b/src/cascadia/TerminalApp/AppLogic.idl
@@ -25,6 +25,7 @@ namespace TerminalApp
         Boolean HasSettingsStartupActions();
 
         void ReloadSettings();
+        void ReloadSettingsThrottled();
         Microsoft.Terminal.Settings.Model.CascadiaSettings Settings { get; };
 
         TerminalWindow CreateNewWindow();
diff --git a/src/cascadia/WindowsTerminal/WindowEmperor.cpp b/src/cascadia/WindowsTerminal/WindowEmperor.cpp
index 64fb25e02f..07e96fcc2e 100644
--- a/src/cascadia/WindowsTerminal/WindowEmperor.cpp
+++ b/src/cascadia/WindowsTerminal/WindowEmperor.cpp
@@ -994,7 +994,13 @@ LRESULT WindowEmperor::_messageHandler(HWND window, UINT const message, WPARAM c
                 if (isCurrentlyDark != _currentSystemThemeIsDark)
                 {
                     _currentSystemThemeIsDark = isCurrentlyDark;
-                    _app.Logic().ReloadSettings();
+
+                    // GH#19505: WM_SETTINGCHANGE gets sent out with a SendMessage() call, which means
+                    // that COM methods marked as [input_sync] cannot be called. Well, our CascadiaSettings
+                    // loader does call such methods. This results in RPC_E_CANTCALLOUT_ININPUTSYNCCALL, aka:
+                    // "An outgoing call cannot be made since the application is dispatching an input-synchronous call."
+                    // The solution is to simply do it in another tick.
+                    _app.Logic().ReloadSettingsThrottled();
                 }
             }
             return 0;