Using `hosts` action cause losing your local changes

Summary

When one uses hosts action after changing something in /etc/hosts, all this changes are gone.

Steps to reproduce

- hosts: host1
  roles:
    - role: "system"
      action: "hosts"

- hosts: host1
  tasks:
    - become: yes
      lineinfile:
        path: "/etc/hosts"
        line: "127.0.0.1 pajac"

- hosts: host1
  roles:
    - role: "system"
      action: "hosts"

Expected behavior

/etc/hosts with line 127.0.0.1 pajac.

Actual behavior

/etc/hosts without this line.

Relevant logs and/or screenshots

nothing here

Possible fixes

Template should be changed to lineinfile or blockinfile.