Fix relation editor widget in autogenerated forms

Fix #17525

src/gui/qgsattributeform.cpp

@@ -1334,10 +1334,10 @@ void QgsAttributeForm::init()
       const QgsEditorWidgetSetup setup = QgsGui::editorWidgetRegistry()->findBest( mLayer, rel.id() );
       rww->setConfig( setup.config() );
       rww->setContext( mContext );
-      gridLayout->addWidget( rww->widget(), row++, 0, 1, 2 );
 
       QgsAttributeFormRelationEditorWidget *formWidget = new QgsAttributeFormRelationEditorWidget( rww, this );
       formWidget->createSearchWidgetWrappers( mContext );
+      gridLayout->addWidget( formWidget, row++, 0, 1, 2 );
 
       mWidgets.append( rww );
       mFormWidgets.append( formWidget );