when i choose bind_masterzones_path other than masters, it breaks my nameserver config and bind denies to start.

this is because of this line:

- name: Copy master zone files
  copy: src={{ bind_masterzones_path }}/db.{{ item.name }} dest={{ bind_base_zones_path }}/{{bind_masterzones_path}} owner={{ bind_user }} group={{ bind_group }}

which will copy config files to dest=/var/lib/bind/masters which is a pre existing directory. if you change it to /var/lib/bind/XYZ where XYZ does not exist, it will copy the contents of your zone file to this file. So we should either pre create the directory or specify destination file name.