Name attribute shows empty when creating custom fields on product creation form

[PatrickSH]

When i try to add new fields to product creationgform in the html name attribute shows up empty, i tried to add the new field both by extending product_form.xml and by using a modifier but both approches ends up the same - a empty name attribute.

I also added these custom fields to
category_form.xml
cms_page_form.xml

Using the exact same method and here it works perfectly.

Preconditions

1. Linux - Ubuntu
2. Mysql 5.6
3. PHP 7.0.12
4. Magento 2.1.5

Steps to reproduce

1. Extend product_form.xml to your custom module Vendor/Component/view/adminhtml/ui_component/product_form.xml

2. Add the code you need for the custom field to show up i will show my code of both modifier and by using pure XML

<?xml version="1.0" encoding="UTF-8"?>
<!--
/**
 * Copyright © 2013-2017 Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
     <fieldset name="hidden_fields"><!-- Hidden fields -->
        <argument name="data" xsi:type="array">
            <item name="config" xsi:type="array">
                <item name="collapsible" xsi:type="boolean">false</item>
                <item name="label" xsi:type="string" translate="true">Label</item>
                <item name="sortOrder" xsi:type="number">200</item>
                <item name="display" xsi:type="string">false</item>
                <item name="additionalClasses" xsi:type="string">hiddenFieldSet</item>
            </item>
        </argument>

        <field name="holder">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="dataType" xsi:type="string">string</item>
                    <item name="formElement" xsi:type="string">input</item>
                    <item name="additionalClasses" xsi:type="string">holder</item>
                </item>
            </argument>
        </field>

        <field name="another_holder">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="dataType" xsi:type="string">string</item>
                    <item name="formElement" xsi:type="string">input</item>
                    <item name="additionalClasses" xsi:type="string">another_holder</item>
                </item>
            </argument>
        </field>
    </fieldset>
    
    <fieldset name="fields">
        <argument name="data" xsi:type="array">
            <item name="config" xsi:type="array">
                <item name="collapsible" xsi:type="boolean">false</item>
                <item name="label" xsi:type="string" translate="true">fields</item>
                <item name="sortOrder" xsi:type="number">300</item>
                <item name="additionalClasses" xsi:type="string">shownFieldSet</item>
            </item>
        </argument>
        <field name="addfield">
            <argument name="data" xsi:type="array">
                <item name="options" xsi:type="object">VEndor\Namespace\Ui\Component\Listing\Page\Options</item>
                <item name="config" xsi:type="array">
                    <item name="dataType" xsi:type="string">int</item>
                    <item name="label" xsi:type="string" translate="true">Tilføj nyt felt</item>
                    <item name="formElement" xsi:type="string">select</item>
                    <item name="dataScope" xsi:type="string">new_block</item>
                    <item name="default" xsi:type="string">0</item>
                </item>
            </argument>
        </field>
   </fieldset>
</form>

Using modifier

<?php
namespace Vendor\Namespace\Ui\Component\Form;

use Magento\Catalog\Ui\DataProvider\Product\Form\Modifier\AbstractModifier;
use Vendor\Namespace\Ui\Component\Listing\Page\Options as SelectOptions;

class AddFillFieldsData extends AbstractModifier
{
    public function __construct(
        SelectOptions $SelectOptions
        )
    {
        $this->selectOptions = $SelectOptions;
    }
    public function modifyMeta(array $meta)
    {
        $meta['fields'] = [
            'arguments' => [
                'data' => [
                    'config' => [
                        'label' => __('Feields'),
                        'sortOrder' => 300,
                        'collapsible' => true,
                        'componentType' => 'fieldset'
                    ]
                ]
            ],
            'children' => [
                'new_field' => [
                    'arguments' => [
                        'data' => [
                            'config' => [
                                'formElement' => 'select',
                                'componentType' => 'field',
                                'options' => $this->selectOptions->toOptionArray(),
                                'visible' => 1,
                                'dataScope' => "new_field",
                                'required' => 0,
                                'label' => __('Tilføj nyt felt')
                            ]
                        ]
                    ]
                ]
            ]
        ];

        return $meta;
    }

    /**
     * {@inheritdoc}
     */
    public function modifyData(array $data)
    {
        return $data;
    }
}

di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
     <virtualType name="Magento\Catalog\Ui\DataProvider\Product\Form\Modifier\Pool">
        <arguments>
            <argument name="modifiers" xsi:type="array">
                <item name="fields" xsi:type="array">
                    <item name="class" xsi:type="string">Vendor\Namespace\Ui\Component\Form\AddFillFieldsData</item>
                    <item name="sortOrder" xsi:type="number">1000</item>
                </item>
            </argument>
        </arguments>
    </virtualType>
</config>

3. Clear cache and recompile You should now see the field with a blank name attribute

Expected result

Name attribute should not be blank

Actual result

Name attribute shows up blank

[SilvanLaroo]

Same issue here, added fields by using a Modifier. Fields are shown fine, but the name attribute is empty.

[magento-engcom-team]

@PatrickSH, thank you for your report.
We've created internal ticket(s) MAGETWO-81311 to track progress on the issue.