Vue files not included in coverage reports

Question

jest: 28.1.3, vue-jest: 3.0.7 vue: 2.7.8

my jest.config.js is:

module.exports = {
  clearMocks: true,
  collectCoverage: true,
  collectCoverageFrom: ['src/**/*.{js,vue}', '!**/node_modules/**'],
  
  transform: {
    '^[^.]+.vue$': 'vue-jest',
    '^.+\\.js$': 'babel-jest',
    '.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
      './mocks/fileMock.js',
  },
  coverageReporters: ['html'],
  coverageThreshold: {
    global: {
      statements: 90,
      functions: 90,
      branches: 90,
    },
  },
  moduleFileExtensions: ['js', 'vue'],
  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/src/$1',
  },
};

when I use jest --coverage to run jest, I found some vue files not included in coverage reports, but some vue files is ok, (Sidebar/index.vue is not in, but CommonList/Item.vue is ok):

when compare these vue compoents files, I found that when vue component file has no "import", it did not in coverage reports, when import anything, import something:

this vue component file can be report in coveage reports:

so what happened and what should I do ?