Issue #3514800 by just_like_good_vibes: missing values from props form when component form is embedded

Closes #3514800

src/Element/ComponentPropsForm.php

@@ -58,6 +58,9 @@ class ComponentPropsForm extends ComponentFormBase {
       '#process' => [
         [$class, 'buildForm'],
       ],
+      '#after_build' => [
+        [$class, 'afterBuild'],
+      ],
     ];
   }