map.on('error') not listening to 401 error

Hi
I was trying to capture invalid token error i.e 401 inside map.on('error') listner but unfortunately this error is not being caught by error handler. Please let me know how can I listen to this error.

Code Sample - 
` map.on('error', (e)=> {
      console.log("error -------", e); 
   })`

