Drupal 8.x

Hello
Just update with Composer a D8.3.2 site to 8.3.4.

When I run the drush updb :

../vendor/drush/drush/drush updb  
The following module is missing from the file system: entity bootstrap.inc:250                                                     [warning]
No database updates required          

[success]

Why this "module missing : entity" ?
I think entity is now in the Drupal Core ?

I was working through the beginning tutorials with my local install of Drupal 8.3.1, but on beginning lesson 46 https://www.youtube.com/watch?v=6dgL1lNj5Kw I have never been able to see telephone numbers on my events, even after going through the lesson several times. I went through the steps to install the telephone module again but then was told that the phone module is now part of Drupal core. Why is the phone module not working for me?

I have a site with drupal that is two years old running Drupal 7.3.9. I just moved a different site to Drupal 8.3.3. On my old site in Drupal 7 I have it set up so that when a visitor to my page clicks on the title of my site in the header of my site they will go to my front page no matter what page they are on in my site. I can't figure out how I did that and would like to do the same thing on my site in Drupal 8. Does anyone know how to do this?

First post. If this should be shared elsewhere, please tell me where to post.

Hi. I'm trying to render dependent webform element fields based on a select input. So, if I select a country on the first field a second field must be shown with it's respective states.

It's working fine but, after the ajax reload, the ajax callback is not triggerd anymore.

I figure out that the field Id it's not the same after ajax reloads the form. How can I update the javascript with the current field Id after ajax form reload?

Is It possible prevent the field Id replacement after an ajax form reload?

The code is as follows: