Language specific node after updation redirects to /node/xyz instead of lang/alias on Drupal 8.5.3

Here are the steps .

  1. Load the page in browser mydomain.com/eu/custom-page
  2. Click on contextual edit button which opens the drupal editing interface.
  3. Make updates on custom-page node.
  4. Save and Publish the changes.
  5. Page is redirected to mydomain.com/node/xyz instead of mydomain.com/eu/custom-page . Although the updates are saved.

Can somebody suggest what should I do to fix this ?

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/4/feed