Have jcrMultiField which are enable i18n = true like below:

form:
  properties:
    title:
      i18n: true
      $type: textField
    addresses:
      label: Addresses
      i18n: true
      $type: jcrMultiField
      itemProvider:
        $type: currentItemProvider
      field:
        $type: compositeField
        properties:
          street:
            label: Street name
            $type: textField 

Steps to reproduce

1. Create one page from "test" template. See my light dev  test.zip
2. Add 3 value for addresses fields in english form. See 
3. Add 2 value for addresses fields in german form. See 
4. Observe 5 address node in JCR browser. See 
5. Call rest pages rest endpoint config in test light-dev. 
6. Retrieve lang = all, and lang = en correctly. See   
7. Retrieve lang = de incorrectly. See the red one is wrong 

.. Logs, screenshots, gifs...

Expected results

Retrieve lang = de correctly. It means retrieve list [addresses0, addresses1] only 

Actual results

Retrieve lang = de incorrectly. See [addresses0, addresses1, addresses2]

Workaround

Development notes