I am encountering the same in #108 . The __internal__.migrations.version always is 8.1.01 from electron-store instead of my project. I have to resort to the workaround by add projectVersion to get the right version:

const store = new Store({
  projectVersion: app.getVersion(), 
  schema,
  beforeEachMigration: (store, context) => {
    console.log(
      `[main-config] migrate from ${context.fromVersion} → ${context.toVersion}`,
    )
  },
  migrations: {
    '<1.2.2': (store) => {
      console.log('[<1.2.2]')
    },
    '>=1.2.2': (store) => {
      // ...
    },
    '>=1.2.3': (store) => {
      console.log('[>=1.2.3]')
    },
  },
})