Fixed "Product type" dropdown on WP 5.5

WP 5.5 doesn't introduce a <span> tag inside metaboxes headings

assets/css/admin.scss

@@ -4347,14 +4347,13 @@ img.help_tip {
 
 		span {
 			display: block;
-			vertical-align: middle;
 			line-height: 24px;
+		}
 
-			span {
-				display: inline;
-				line-height: inherit;
-				vertical-align: baseline;
-			}
+		.type_box {
+			display: inline;
+			line-height: inherit;
+			vertical-align: baseline;
 		}
 
 		select {
@@ -6819,6 +6818,23 @@ table.bar_chart {
 	}
 }
 
+.wc-wp-version-gte-55 {
+
+	#woocommerce-product-data {
+
+		.hndle {
+			display: block;
+			line-height: 24px;
+
+			.type_box {
+				display: inline;
+				line-height: inherit;
+				vertical-align: baseline;
+			}
+		}
+	}
+}
+
 /**
   * Select2 colors for built-in admin color themes.
   */

assets/js/admin/meta-boxes-product.js

@@ -27,7 +27,11 @@ jQuery( function( $ ) {
 	});
 
 	// Type box.
-	$( '.type_box' ).appendTo( '#woocommerce-product-data .hndle span' );
+	if ( $( 'body' ).hasClass( 'wc-wp-version-gte-55' ) ) {
+		$( '.type_box' ).appendTo( ' #woocommerce-product-data .hndle' );
+	} else {
+		$( '.type_box' ).appendTo( ' #woocommerce-product-data .hndle span' );
+	}
 
 	$( function() {
 		// Prevent inputs in meta box headings opening/closing contents.

includes/admin/class-wc-admin.php

@@ -331,6 +331,11 @@ public function include_admin_body_class( $classes ) {
 			$classes .= ' wc-wp-version-gte-53';
 		}
 
+		// Add WP 5.5+ compatibility class.
+		if ( $raw_version && version_compare( $version, '5.5', '>=' ) ) {
+			$classes .= ' wc-wp-version-gte-55';
+		}
+
 		return $classes;
 	}
 }