Possible ansible bug (2 devel) in custom filters using with_items

ansible.cfg

[defaults]
filter_plugins = .

core.py

def filter_list(inputlist, attrib, lookuplist):
    result = []

    for item in inputlist:
        if item[attrib] in lookuplist:
            result.append(item)

    return result

class FilterModule(object):
    def filters(self):
        return {
            "byattr": filter_list,
        }

testplay.yml

---
- hosts: 127.0.0.1
  connection: local

  vars:
    mylist:
    - bar: first
      foo: a
    - bar: second
      foo: b
    - bar: third
      foo: c
    
    my_filter: ['first', 'second']

    # Create a new var with my custom filter applied:
    my_filtered_list: "{{ mylist | byattr('bar', my_filter) }}"

  tasks:
  
  # works fine - only 'first' and 'second' items are shown
  - name: "test 1"
    debug: msg="{{ my_filtered_list }}" 

  # also fine
  - name: "test 2"
    debug: msg="{{ item }}"
    with_items: "{{ mylist }}"

  # fails!? with: ...no filter named 'byattr'
  - name: "test 3"
    debug: msg="{{ item }}"
    with_items: "{{ my_filtered_list }}"


  # (note the extra ' postfixed to "byattr" in the error message)

  # to run (include trailing comma!):
  # $ ansible-playbook testplay.yml -i 127.0.0.1,