为什么窗体在前一个值而不是默认值处调用onreset?

const myForm = document.getElementById('my-Form')

myForm.onsubmit=e=> {
  e.preventDefault()  // disable for  test
}
myForm.onreset=_=> {
  console.log( 'onReset event, aName = ', myForm.aName.value )
} 

document.getElementById('bt-Test').onclick=_=> {
  myForm.aName.value = 'other value'
  myForm.reset()  // didn't write 'Default value'
}

<form id="my-Form" action="xxx" method="post">
  <input type="text" name="aName" value="Default value" >
 <br><br> 
  <button type="reset">reset</button>
</form>
<br> 
<button type="button" id="bt-Test">Test button</button>