diff --git a/openless-all/app/scripts/windows-package-msvc.test.mjs b/openless-all/app/scripts/windows-package-msvc.test.mjs
index ce5aa4ec..374fa036 100644
--- a/openless-all/app/scripts/windows-package-msvc.test.mjs
+++ b/openless-all/app/scripts/windows-package-msvc.test.mjs
@@ -11,6 +11,7 @@ const launcherPath = join(scriptsDir, "windows-package-msvc.cmd");
 const ciWorkflowPath = join(repoRoot, ".github", "workflows", "release-tauri.yml");
 const imeBuildPath = join(scriptsDir, "windows-ime-build.ps1");
 const imeInstallSmokePath = join(scriptsDir, "windows-ime-install-smoke.ps1");
+const realAsrInsertionSmokePath = join(scriptsDir, "windows-real-asr-insertion-smoke.ps1");
 const imeRegisterPath = join(scriptsDir, "windows-ime-register.ps1");
 const imeUnregisterPath = join(scriptsDir, "windows-ime-unregister.ps1");
 const imeSolutionPath = join(appRoot, "windows-ime", "OpenLessIme.sln");
@@ -26,6 +27,7 @@ const launcher = readFileSync(launcherPath, "utf8");
 const ciWorkflow = readFileSync(ciWorkflowPath, "utf8");
 const imeBuild = readFileSync(imeBuildPath, "utf8");
 const imeInstallSmoke = readFileSync(imeInstallSmokePath, "utf8");
+const realAsrInsertionSmoke = readFileSync(realAsrInsertionSmokePath, "utf8");
 const imeRegister = readFileSync(imeRegisterPath, "utf8");
 const imeUnregister = readFileSync(imeUnregisterPath, "utf8");
 const imeSolution = readFileSync(imeSolutionPath, "utf8");
@@ -105,8 +107,11 @@ assert.match(imeTextService, /TF_ES_ASYNC \| TF_ES_READWRITE/, "IME should retry
 assert.match(imeTextService, /WaitForSingleObject/, "IME pipe submit should wait for async edit-session completion");
 assert.match(imeEditSession, /SetEvent/, "IME edit session should signal async completion back to the pipe submitter");
 assert.match(imeEditSession, /Collapse\(edit_cookie, TF_ANCHOR_END\)/, "IME should collapse the committed range to its end after insertion");
-assert.match(imeEditSession, /SetSelection\(edit_cookie, 1, &selection\)/, "IME should move the caret to the end of inserted text");
-assert.match(imeEditSession, /TF_AE_END/, "IME should make the end of the committed text the active selection end");
+assert.match(imeEditSession, /SetSelection\(edit_cookie, 1, &selection\)/, "IME should move the caret to the end of inserted text");
+assert.match(imeEditSession, /TF_AE_END/, "IME should make the end of the committed text the active selection end");
+const insertAtSelectionCalls = imeEditSession.match(/\bInsertTextAtSelection\s*\(/g) ?? [];
+assert.equal(insertAtSelectionCalls.length, 1, "IME should submit the dictated text to the host exactly once");
+assert.doesNotMatch(imeEditSession, /TF_IAS_QUERYONLY/, "IME should not preflight the full text through host text stores before committing it");
 
 assert.match(wixFragment, /DirectoryRef Id="INSTALLDIR"/, "WiX fragment should install into the app directory");
 assert.match(wixFragment, /Component Id="OpenLessImeDllX64Component"/, "WiX fragment should define the x64 TSF DLL component");
@@ -145,6 +150,7 @@ assert.match(imeInstallSmoke, /Join-ProcessArguments/, "install smoke should quo
 assert.match(imeInstallSmoke, /\$commandLine = Join-ProcessArguments \$ArgumentList/, "install smoke should build a single quoted command line");
 assert.match(imeInstallSmoke, /Start-Process -FilePath \$FilePath -ArgumentList \$commandLine/, "install smoke should pass a single quoted command line to Start-Process");
 assert.match(imeInstallSmoke, /OpenLessImeSubmit/, "install smoke should preserve TSF backend context");
+assert.match(realAsrInsertionSmoke, /\$targetTextForComparison -cne \$finalTextForComparison/, "real insertion smoke should reject duplicate or partial text in initially empty targets");
 assert.match(imeInstallSmoke, /Software\\Classes\\CLSID\\\{6B9F3F4F-5EE7-42D6-9C61-9F80B03A5D7D\}\\InprocServer32/, "install smoke should check x64 COM registration");
 assert.match(imeInstallSmoke, /Software\\WOW6432Node\\Classes\\CLSID\\\{6B9F3F4F-5EE7-42D6-9C61-9F80B03A5D7D\}\\InprocServer32/, "install smoke should check x86 COM registration");
 assert.match(imeInstallSmoke, /LanguageProfile\\0x00000804\\\{9B5F5E04-23F6-47DA-9A26-D221F6C3F02E\}/, "install smoke should check the TSF language profile");
diff --git a/openless-all/app/scripts/windows-real-asr-insertion-smoke.ps1 b/openless-all/app/scripts/windows-real-asr-insertion-smoke.ps1
index d058e24a..0c29af84 100644
--- a/openless-all/app/scripts/windows-real-asr-insertion-smoke.ps1
+++ b/openless-all/app/scripts/windows-real-asr-insertion-smoke.ps1
@@ -1016,7 +1016,13 @@ try {
   if ([string]::IsNullOrWhiteSpace($targetText)) {
     throw "$Target readback is empty."
   }
-  if (-not $targetText.Contains($latest.finalText)) {
+  $targetTextForComparison = $targetText.Replace("`r`n", "`n")
+  $finalTextForComparison = ([string]$latest.finalText).Replace("`r`n", "`n")
+  $targetStartsEmpty = $Target -in @("notepad", "browser", "win32edit")
+  if ($targetStartsEmpty -and $targetTextForComparison -cne $finalTextForComparison) {
+    throw "$Target readback does not exactly match latest finalText in an initially empty target; duplicate or partial insertion detected (expected length=$($finalTextForComparison.Length), actual length=$($targetTextForComparison.Length))."
+  }
+  if (-not $targetStartsEmpty -and -not $targetText.Contains($latest.finalText)) {
     if ($targetText.Contains($clipboardSentinel)) {
       throw "$Target readback contains the pre-dictation clipboard sentinel instead of latest finalText."
     }
diff --git a/openless-all/app/windows-ime/src/edit_session.cpp b/openless-all/app/windows-ime/src/edit_session.cpp
index 1960dc25..762afa0c 100644
--- a/openless-all/app/windows-ime/src/edit_session.cpp
+++ b/openless-all/app/windows-ime/src/edit_session.cpp
@@ -101,38 +101,30 @@ HRESULT OpenLessEditSession::InsertText(TfEditCookie edit_cookie) {
     return hr;
   }
 
-  ITfRange* query_range = nullptr;
-  hr = insert_at_selection->InsertTextAtSelection(
-      edit_cookie, TF_IAS_QUERYONLY, text_.c_str(),
-      static_cast<LONG>(text_.size()), &query_range);
-  if (query_range != nullptr) {
-    query_range->Release();
-    query_range = nullptr;
-  }
-
-  if (SUCCEEDED(hr) && cancellation_ && cancellation_->load()) {
-    hr = HRESULT_FROM_WIN32(ERROR_CANCELLED);
+  if (cancellation_ && cancellation_->load()) {
+    insert_at_selection->Release();
+    return HRESULT_FROM_WIN32(ERROR_CANCELLED);
   }
 
-  if (SUCCEEDED(hr)) {
-    ITfRange* committed_range = nullptr;
-    hr = insert_at_selection->InsertTextAtSelection(
-        edit_cookie, 0, text_.c_str(), static_cast<LONG>(text_.size()),
-        &committed_range);
-    if (committed_range != nullptr) {
-      if (SUCCEEDED(hr)) {
-        const HRESULT collapse_hr =
-            committed_range->Collapse(edit_cookie, TF_ANCHOR_END);
-        if (SUCCEEDED(collapse_hr)) {
-          TF_SELECTION selection = {};
-          selection.range = committed_range;
-          selection.style.ase = TF_AE_END;
-          selection.style.fInterimChar = FALSE;
-          (void)context_->SetSelection(edit_cookie, 1, &selection);
-        }
+  // Commit in a single call. Some Chromium-backed text stores surface a
+  // full-text QUERYONLY preflight as an edit and then duplicate the real commit.
+  ITfRange* committed_range = nullptr;
+  hr = insert_at_selection->InsertTextAtSelection(
+      edit_cookie, 0, text_.c_str(), static_cast<LONG>(text_.size()),
+      &committed_range);
+  if (committed_range != nullptr) {
+    if (SUCCEEDED(hr)) {
+      const HRESULT collapse_hr =
+          committed_range->Collapse(edit_cookie, TF_ANCHOR_END);
+      if (SUCCEEDED(collapse_hr)) {
+        TF_SELECTION selection = {};
+        selection.range = committed_range;
+        selection.style.ase = TF_AE_END;
+        selection.style.fInterimChar = FALSE;
+        (void)context_->SetSelection(edit_cookie, 1, &selection);
       }
-      committed_range->Release();
     }
+    committed_range->Release();
   }
 
   insert_at_selection->Release();