Readonly QLineEdit writable using input method

# CMakeLists.txt
cmake_minimum_required(VERSION 3.14)
project(lineEditReadOnlyInputMethodBug)
find_package(Qt6 REQUIRED COMPONENTS Widgets)
qt_add_executable(${PROJECT_NAME} main.cpp)
target_link_libraries(${PROJECT_NAME} PRIVATE Qt6::Widgets) 

// main.cpp
#include <QApplication>
#include <QLineEdit>
int main(int argc, char **argv){
  QApplication a{argc, argv};
  QLineEdit le;
  le.setPlaceholderText("A readonly QLineEdit");
  le.setReadOnly(true);
  le.show();
  return a.exec();
}