diff --git a/src/Umbraco.Web.BackOffice/Mapping/ContentMapDefinition.cs b/src/Umbraco.Web.BackOffice/Mapping/ContentMapDefinition.cs
index d64d3d297e..a310944a6d 100644
--- a/src/Umbraco.Web.BackOffice/Mapping/ContentMapDefinition.cs
+++ b/src/Umbraco.Web.BackOffice/Mapping/ContentMapDefinition.cs
@@ -130,6 +130,11 @@ internal class ContentMapDefinition : IMapDefinition
     // Umbraco.Code.MapAll
     private void Map(ContentItemDisplay source, ContentItemDisplayWithSchedule target, MapperContext context)
     {
+        foreach (KeyValuePair<string, object> additionalData in source.AdditionalData)
+        {
+            target.AdditionalData.Add(additionalData);
+        }
+
         target.AllowedActions = source.AllowedActions;
         target.AllowedTemplates = source.AllowedTemplates;
         target.AllowPreview = source.AllowPreview;
@@ -198,6 +203,11 @@ internal class ContentMapDefinition : IMapDefinition
     // Umbraco.Code.MapAll
     private static void Map(ContentItemDisplayWithSchedule source, ContentItemDisplay target, MapperContext context)
     {
+        foreach (KeyValuePair<string, object> additionalData in source.AdditionalData)
+        {
+            target.AdditionalData.Add(additionalData);
+        }
+
         target.AllowedActions = source.AllowedActions;
         target.AllowedTemplates = source.AllowedTemplates;
         target.AllowPreview = source.AllowPreview;