Error message shown on review page when optional middle name is left empty

[oni-on1003]

Describe the bug
We have an optional middle name field. If this field has no value, the review page displays an error.

Which feature of OpenCRVS your bug concern?
Declaration form configuration

To Reproduce
Steps to reproduce the behaviour:

1. Create a name field similar to the code below

{
      id: 'child.name',
      type: FieldType.NAME,
      required: true,
      configuration: {
        maxLength: MAX_NAME_LENGTH,
        name: {
          firstname: {
            required: true
          },
          middlename: {
            required: false
          },
          surname: {
            required: true
          }
        }
      },
      hideLabel: true,
      label: {
        defaultMessage: "Child's name",
        description: 'This is the label for the field',
        id: 'event.birth.action.declare.form.section.child.field.name.label'
      },
      validation: [ invalidNameValidator('child.name')]
    },

2. Update the invalidNameValidator validator and add this line inside the validator property
   middlename: field('middlename').isValidEnglishName(),
3. Create a declaration and check the review page

Expected behaviour
The validator should not be triggered if the middle name field is empty.

Country Configuration Version:
v1.9.0-beta-3

Screencast.from.2025-10-22.15-47-54.mp4

[jpye-finch]

Thoughts of discouraging grouping fields on the review page going forward?

So the review page reflects the form ie.:

• Firstname(s)
• Middlename
• Lastname

[euanmillar]

@SyedaAfrida mentioned this bug which we should also address #9821 but it seems to be fixed and closed