diff --git a/src/Umbraco.Infrastructure/PropertyEditors/ValueConverters/RichTextParsingRegexes.cs b/src/Umbraco.Infrastructure/PropertyEditors/ValueConverters/RichTextParsingRegexes.cs
index c7fa4e4592..75851ee856 100644
--- a/src/Umbraco.Infrastructure/PropertyEditors/ValueConverters/RichTextParsingRegexes.cs
+++ b/src/Umbraco.Infrastructure/PropertyEditors/ValueConverters/RichTextParsingRegexes.cs
@@ -4,6 +4,6 @@ namespace Umbraco.Cms.Core.PropertyEditors.ValueConverters;
 
 internal static partial class RichTextParsingRegexes
 {
-    [GeneratedRegex("<umb-rte-block(?:-inline)? data-content-udi=\"(?<udi>.[^\"]*)\"><!--Umbraco-Block--><\\/umb-rte-block(?:-inline)?>")]
+    [GeneratedRegex("<umb-rte-block(?:-inline)?(?: class=\"(.[^\"]*)\")? data-content-udi=\"(?<udi>.[^\"]*)\"><!--Umbraco-Block--><\\/umb-rte-block(?:-inline)?>")]
     public static partial Regex BlockRegex();
 }