Execution semantics for async functions not invoked with await

output.log

executeMultiple | start
executeMultiple | end
executeMultipleAsync | start
executeMultipleAsync | end
executeMultiple | execute1
executeMultipleAsync | execute1
executeMultiple | execute2
executeMultipleAsync | execute2
executeMultipleAsync | callback

sync-async.js

async function execute1(name) {
  return new Promise(resolve => {
    setTimeout(() => {
      console.log(name, '| execute1')
      resolve()
     }, 200);
  });
}

async function execute2(name) {
  return new Promise(resolve => {
    setTimeout(() => {
      console.log(name, '| execute2')
      resolve()
     }, 200);
  });
}

async function executeMultiple() {
  await execute1('executeMultiple');
  await execute2('executeMultiple');
}

async function executeMultipleAsync(callback) {
  await execute1('executeMultipleAsync');
  await execute2('executeMultipleAsync');
  callback();
}

console.log('executeMultiple | start');
executeMultiple();
console.log('executeMultiple | end');

console.log('executeMultipleAsync | start');
executeMultipleAsync(() => {
  console.log('executeMultipleAsync | callback');
});
console.log('executeMultipleAsync | end');