remove explicit check for area block attribute

packages/block-library/src/template-part/edit/placeholder/index.js

@@ -22,16 +22,18 @@ export default function TemplatePartPlaceholder( {
 	const { saveEntityRecord } = useDispatch( coreStore );
 	const onCreate = useCallback( async () => {
 		const title = __( 'Untitled Template Part' );
+		// If we have `area` set from block attributes, means an exposed
+		// block variation was inserted. So add this prop to the template
+		// part entity on creation. Afterwards remove `area` value from
+		// block attributes.
 		const record = {
 			title,
 			slug: 'template-part',
 			content: serialize( innerBlocks ),
+			// `area` is filterable on the server and defaults to `UNCATEGORIZED`
+			// if provided value is not allowed.
+			area,
 		};
-		// If we have `area` set from block attributes, means an exposed
-		// block variation was inserted. So add this prop to the template
-		// part entity on creation. Afterwards remove `area` value from
-		// block attributes.
-		if ( [ 'header', 'footer' ].includes( area ) ) record.area = area;
 		const templatePart = await saveEntityRecord(
 			'postType',
 			'wp_template_part',