diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6104832..c8c809c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## v4.9.0
+- Fixing nested diffable POD structs being incorrectly marked as clean in GetDiff
+
 ## v4.8.2
 - Fixing thread safety possible issue when reading an array of enums 
 - Fixing bug when the target enum array property wouldn't be cleared before reading data 
@@ -6,4 +9,4 @@
 - Using C# built-in initialization routines instead of MetaIO's methods
 
 ## v4.7.0
-- Array comparison generated code now takes bitfields token into account for array entries 
\ No newline at end of file
+- Array comparison generated code now takes bitfields token into account for array entries 
diff --git a/tpl/macro.twig b/tpl/macro.twig
index 4deaeb6..7aff355 100644
--- a/tpl/macro.twig
+++ b/tpl/macro.twig
@@ -542,6 +542,16 @@ public class {{o.name}} : IRpc
     {
       MetaIO.SetFieldDirty(ref a.fields_mask, {{field_idx}});
       is_equal = false;
+
+      {% if has_token(f.type.value, 'bitfields') ~%}
+      //TODO: inefficient but reliable: marking the WHOLE collection as dirty when size changes
+      for(int i=0;i<a.{{f.name}}.Count;++i)
+      {
+          var tmp_{{f.name}} = a.{{f.name}}[i];
+          tmp_{{f.name}}.fields_mask = FieldsMask.MakeDirty(tmp_{{f.name}}.GetFieldsCount());
+          a.{{f.name}}[i] = tmp_{{f.name}};
+      }
+      {% endif ~%}
     }
     else
     {