Which @angular/* package(s) are the source of the bug?

forms

Is this a regression?

No

Description

When you use ngModel in a child component, it fails to register itself to a NgForm that is held by a parent component.

This causes validation fail or success in the NgModel to bubble up to the NGForm, leaving the NgForm in a different state as the contents inside of it.

Please provide a link to a minimal reproduction of the bug

StackBlitz

Anything else?

The problem seems to come from using @Host when injecting ControlContainer into ngModel.
You can see it in this line. The @Host will limit it to the component it is in, instead of "bubbling up" to where the form is.

Also [ngModelGroup] seems to have the same issue. At least it is using @Host() in similar way code line