Not sure what you're doing wrong. Maybe it's the way you define 
dev_interfaces (yeah, it makes no sense why it would work in debug, but not 
in with_items, but sometimes that happens).

This worked for me:
---
- name: stuff
  connection: local
  gather_facts: no
  hosts: localhost

  vars:
    dev_interfaces:
      - subnet: 10.0.0.0/31
        peer_addr: 10.0.0.1
        name: Ethernet0
        mask: 255.255.255.254
        prefixlen: 31
        addr: 10.0.0.0

  tasks:
    - debug: msg="{{ dev_interfaces[0].name }}"

    - name: debug message interface name
      debug: msg="{{item.name}}"
      with_items: "{{ dev_interfaces }}"


output:
PLAY [stuff] 
****************************************************************** 

TASK: [debug msg="{{ dev_interfaces[0].name }}"] 
****************************** 
ok: [localhost] => {
    "msg": "Ethernet0"
}

TASK: [debug message interface name] 
****************************************** 
ok: [localhost] => (item={'subnet': '10.0.0.0/31', 'peer_addr': '10.0.0.1', 
'name': 'Ethernet0', 'prefixlen': 31, 'mask': '255.255.255.254', 'addr': 
'10.0.0.0'}) => {
    "item": {
        "addr": "10.0.0.0", 
        "mask": "255.255.255.254", 
        "name": "Ethernet0", 
        "peer_addr": "10.0.0.1", 
        "prefixlen": 31, 
        "subnet": "10.0.0.0/31"
    }, 
    "msg": "Ethernet0"
}

PLAY RECAP 
******************************************************************** 
localhost                  : ok=2    changed=0    unreachable=0    failed=0 
  




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