diff --git a/shell/platform/darwin/macos/framework/Source/FlutterTextInputPlugin.mm b/shell/platform/darwin/macos/framework/Source/FlutterTextInputPlugin.mm
index 1c3b92e5ef183..af86a3e9ec139 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterTextInputPlugin.mm
+++ b/shell/platform/darwin/macos/framework/Source/FlutterTextInputPlugin.mm
@@ -742,6 +742,18 @@ - (void)insertText:(id)string replacementRange:(NSRange)range {
 
     _activeModel->SetSelection(flutter::TextRange(base, extent));
   }
+  else if (_activeModel->composing() && !(_activeModel->composing_range() == _activeModel->selection())) {
+    // When confirmed by Japanese IME, string replaces range of composing_range.
+    // If selection == composing_range there is no problem.
+    // If selection ! = composing_range the range of selection is only a part of composing_range.
+    // Since _activeModel->AddText is processed first for selection, the finalization of the conversion 
+    // cannot be processed correctly unless selection == composing_range or selection.collapsed().
+    // Since _activeModel->SetSelection fails if (composing_ && !range.collapsed()), 
+    // selection == composing_range will failed.
+    // Therefore, the selection cursor should only be placed at the beginning of composing_range.
+    flutter::TextRange composing_range = _activeModel->composing_range();
+    _activeModel->SetSelection(flutter::TextRange(composing_range.start()));
+  }
 
   flutter::TextRange oldSelection = _activeModel->selection();
   flutter::TextRange composingBeforeChange = _activeModel->composing_range();