What callback function should come inside micro task queue?

setTimeout(() => {
  console.log('1st callback function');
}, 1000);

fetch('https://api.netflix.com').then(() => {
  console.log('2nd callback Function');
});

These both are the Callback Function but as i heard that setTimeout callback function will go inside the Task queue/Callback queue and fetch Callback function is go inside the Micro Task Queue. so what the reason behind this?