Issue #2389275 by bforchhammer: Views render element #embed not working

core/modules/views/src/Element/View.php

core/modules/views/src/Tests/ViewElementTest.php

...ews_test_config/test_views/views.view.test_view_embed.yml

...iews_test_data/src/Form/ViewsTestDataElementEmbedForm.php

...les/views_test_data/src/Form/ViewsTestDataElementForm.php

...tests/modules/views_test_data/views_test_data.routing.yml