diff --git a/app/code/Magento/Catalog/view/adminhtml/ui_component/category_form.xml b/app/code/Magento/Catalog/view/adminhtml/ui_component/category_form.xml
index c49bf084adf16..79b71c2bb26bf 100644
--- a/app/code/Magento/Catalog/view/adminhtml/ui_component/category_form.xml
+++ b/app/code/Magento/Catalog/view/adminhtml/ui_component/category_form.xml
@@ -424,7 +424,7 @@
         </settings>
         <container name="assign_products_container" sortOrder="160">
             <htmlContent name="html_content">
-                <argument name="block" xsi:type="object">Magento\Catalog\Block\Adminhtml\Category\AssignProducts</argument>
+                <block name="gallery" class="Magento\Catalog\Block\Adminhtml\Category\AssignProducts"/>
             </htmlContent>
         </container>
     </fieldset>
diff --git a/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/category_form.xml b/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/category_form.xml
index 7719d54873a91..11adc860d8931 100644
--- a/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/category_form.xml
+++ b/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/category_form.xml
@@ -13,7 +13,7 @@
         </settings>
         <container name="google_experiment_container" sortOrder="250">
             <htmlContent name="html_content">
-                <argument name="block" xsi:type="object">Magento\GoogleOptimizer\Block\Adminhtml\Catalog\Category\Edit\Googleoptimizer</argument>
+                <block name="googleoptimizer" class="Magento\GoogleOptimizer\Block\Adminhtml\Catalog\Category\Edit\Googleoptimizer"/>
             </htmlContent>
         </container>
     </fieldset>
diff --git a/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/cms_page_form.xml b/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/cms_page_form.xml
index da6fee3404e43..d09be65f29134 100644
--- a/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/cms_page_form.xml
+++ b/app/code/Magento/GoogleOptimizer/view/adminhtml/ui_component/cms_page_form.xml
@@ -13,7 +13,7 @@
         </settings>
         <container name="google_experiment_container" sortOrder="250">
             <htmlContent name="html_content">
-                <argument name="block" xsi:type="object">Magento\GoogleOptimizer\Block\Adminhtml\Form\CmsPage</argument>
+                <block name="googleOptimizerBlockAdminhtmlFormCmsPage" class="MagentoGoogleOptimizerBlockAdminhtmlFormCmsPage"/>
             </htmlContent>
         </container>
     </fieldset>
diff --git a/app/code/Magento/SalesRule/view/adminhtml/ui_component/sales_rule_form.xml b/app/code/Magento/SalesRule/view/adminhtml/ui_component/sales_rule_form.xml
index 78b4ab3b982b5..02cab73f63896 100644
--- a/app/code/Magento/SalesRule/view/adminhtml/ui_component/sales_rule_form.xml
+++ b/app/code/Magento/SalesRule/view/adminhtml/ui_component/sales_rule_form.xml
@@ -409,7 +409,7 @@
         </settings>
         <container name="conditions_apply_to" sortOrder="10">
             <htmlContent name="html_content">
-                <argument name="block" xsi:type="object">Magento\SalesRule\Block\Adminhtml\Promo\Quote\Edit\Tab\Conditions</argument>
+                <block name="conditions_apply_to" class="Magento\SalesRule\Block\Adminhtml\Promo\Quote\Edit\Tab\Conditions" />
             </htmlContent>
         </container>
     </fieldset>
@@ -521,7 +521,7 @@
         </field>
         <container name="actions_apply_to" sortOrder="40">
             <htmlContent name="html_content">
-                <argument name="block" xsi:type="object">Magento\SalesRule\Block\Adminhtml\Promo\Quote\Edit\Tab\Actions</argument>
+                <block name="actions_apply_to" class="Magento\SalesRule\Block\Adminhtml\Promo\Quote\Edit\Tab\Actions"/>
             </htmlContent>
         </container>
     </fieldset>
@@ -544,7 +544,7 @@
         </field>
         <container name="store_view_labels" sortOrder="40">
             <htmlContent name="html_content">
-                <argument name="block" xsi:type="object">Magento\SalesRule\Block\Adminhtml\Promo\Quote\Edit\Tab\Labels</argument>
+                <block name="store_view_labels" class="Magento\SalesRule\Block\Adminhtml\Promo\Quote\Edit\Tab\Labels"/>
             </htmlContent>
         </container>
     </fieldset>
diff --git a/app/code/Magento/Ui/Config/Data.php b/app/code/Magento/Ui/Config/Data.php
index a47b5cbc41e55..9c33eaf3fcf95 100644
--- a/app/code/Magento/Ui/Config/Data.php
+++ b/app/code/Magento/Ui/Config/Data.php
@@ -84,7 +84,6 @@ public function __construct(
         $this->componentName = $componentName;
         $this->argumentInterpreter = $argumentInterpreter;
         $this->cacheId = static::CACHE_ID . '_' . $componentName;
-        $this->initData();
     }
 
     /**
@@ -121,7 +120,7 @@ private function initData()
      */
     public function merge(array $config)
     {
-        $this->data = array_replace_recursive($this->data, $config);
+        $this->data = array_replace_recursive($this->get(), $config);
     }
 
     /**
@@ -133,6 +132,9 @@ public function merge(array $config)
      */
     public function get($path = null, $default = null)
     {
+        if (empty($this->data)) {
+            $this->initData();
+        }
         if ($path === null) {
             return $this->data;
         }
diff --git a/dev/tests/integration/testsuite/Magento/Ui/Component/ConfigurationTest.php b/dev/tests/integration/testsuite/Magento/Ui/Component/ConfigurationTest.php
index 087fc03b0e3c1..0972c705cdb35 100644
--- a/dev/tests/integration/testsuite/Magento/Ui/Component/ConfigurationTest.php
+++ b/dev/tests/integration/testsuite/Magento/Ui/Component/ConfigurationTest.php
@@ -53,9 +53,6 @@ class ConfigurationTest extends \PHPUnit_Framework_TestCase
         'argument[@name="data"]/item[@name="config"]/item[@name="multiple"]' => [
             '//*[@formElement="select"]',
             '//*[substring(@component, string-length(@component) - string-length("ui-group") +1) = "ui-group"]'
-        ],
-        'argument[@name="block"]' => [
-            '//*[@name="html_content"]'
         ]
     ];
 
diff --git a/lib/internal/Magento/Framework/Component/ComponentRegistrar.php b/lib/internal/Magento/Framework/Component/ComponentRegistrar.php
index 6e09052f8c8e7..94fbab98423d9 100644
--- a/lib/internal/Magento/Framework/Component/ComponentRegistrar.php
+++ b/lib/internal/Magento/Framework/Component/ComponentRegistrar.php
@@ -46,8 +46,6 @@ class ComponentRegistrar implements ComponentRegistrarInterface
      */
     public static function register($type, $componentName, $path)
     {
-        $path = str_replace("magento2ee", "magento2ce", $path);
-        $path = str_replace("magento2b2b", "magento2ce", $path);
         self::validateType($type);
         if (isset(self::$paths[$type][$componentName])) {
             throw new \LogicException(
diff --git a/lib/internal/Magento/Framework/View/Layout/Reader/UiComponent.php b/lib/internal/Magento/Framework/View/Layout/Reader/UiComponent.php
index 6b45d12a48935..3d2bee67229cd 100644
--- a/lib/internal/Magento/Framework/View/Layout/Reader/UiComponent.php
+++ b/lib/internal/Magento/Framework/View/Layout/Reader/UiComponent.php
@@ -96,7 +96,10 @@ public function interpret(Context $readerContext, Element $currentElement)
         );
         $scheduledStructure->setStructureElementData($referenceName, ['attributes' => $attributes]);
 
-        foreach ($this->getLayoutElementsFromUiConfiguration($referenceName) as $layoutElement) {
+        $elements = [];
+        $config = $this->uiConfigFactory->create(['componentName' => $referenceName])->get($referenceName);
+        $this->getLayoutElementsFromUiConfiguration([$referenceName => $config], $elements);
+        foreach ($elements as $layoutElement) {
             $layoutElement = simplexml_load_string(
                 $layoutElement,
                 Element::class
@@ -110,19 +113,20 @@ public function interpret(Context $readerContext, Element $currentElement)
     /**
      * Find layout elements in UI configuration for correct layout generation
      *
-     * @param string $uiConfigName
-     * @return array
+     * @param array $config
+     * @param array $elements
+     * @return void
      */
-    private function getLayoutElementsFromUiConfiguration($uiConfigName)
+    private function getLayoutElementsFromUiConfiguration(array $config, array &$elements = [])
     {
-        $elements = [];
-        $config = $this->uiConfigFactory->create(['componentName' => $uiConfigName])->get($uiConfigName);
-        foreach ($config['children'] as $name => $data) {
+        foreach ($config as $data) {
             if (isset($data['arguments']['block']['layout'])) {
-                $elements[$name] = $data['arguments']['block']['layout'];
+                $elements[] = $data['arguments']['block']['layout'];
+            }
+            if (isset($data['children']) && !empty($data['children'])) {
+                $this->getLayoutElementsFromUiConfiguration($data['children'], $elements);
             }
         }
-        return $elements;
     }
 
     /**