Field assignment on record creation

[velrest]

Creating model records

If you have your model defined with a @localizedAttr field and directly set the
field on store.createRecord the setter for the field will not be called and
instead of the dictionary with the locale key, the value directly will be assigned
to the field.

The serialized model then looks like this:

{
  "type": "your-model",
  "attributes": {
    "name": "your name"
  } 
}

instead of

{
  "type": "your-model",
  "attributes": {
    "name": {
      "en": "your name"
    }
  } 
}

Solution:
Create your record first and then assign the localized field:

const yourModel = this.store.createRecord("yourModel");
yourModel.name = "this is a test";