source/blender/blenkernel/intern/attribute_access.cc

@@ -510,22 +510,38 @@ bool BuiltinCustomDataLayerProvider::try_create(void *owner,
     return false;
   }
 
+  auto update = [&]() {
+    if (update_on_change_ != nullptr) {
+      update_on_change_(owner);
+    }
+  };
+
   const int element_num = custom_data_access_.get_element_num(owner);
   if (stored_as_named_attribute_) {
     if (CustomData_has_layer_named(custom_data, data_type_, name_)) {
       /* Exists already. */
       return false;
     }
-    return add_custom_data_layer_from_attribute_init(
+    if (add_custom_data_layer_from_attribute_init(
-        name_, *custom_data, stored_type_, element_num, initializer);
+            name_, *custom_data, stored_type_, element_num, initializer))
+    {
+      update();
+      return true;
+    }
+    return false;
   }
 
   if (CustomData_get_layer(custom_data, stored_type_) != nullptr) {
     /* Exists already. */
     return false;
   }
-  return add_builtin_type_custom_data_layer_from_init(
+  if (add_builtin_type_custom_data_layer_from_init(
-      *custom_data, stored_type_, element_num, initializer);
+          *custom_data, stored_type_, element_num, initializer))
+  {
+    update();
+    return true;
+  }
+  return false;
 }
 
 bool BuiltinCustomDataLayerProvider::exists(const void *owner) const

source/blender/blenkernel/intern/curves_geometry.cc

@@ -58,6 +58,8 @@ CurvesGeometry::CurvesGeometry() : CurvesGeometry(0, 0) {}
 
 CurvesGeometry::CurvesGeometry(const int point_num, const int curve_num)
 {
+  this->runtime = MEM_new<CurvesGeometryRuntime>(__func__);
+
   this->point_num = point_num;
   this->curve_num = curve_num;
   CustomData_reset(&this->point_data);
@@ -67,8 +69,6 @@ CurvesGeometry::CurvesGeometry(const int point_num, const int curve_num)
   this->attributes_for_write().add<float3>(
       "position", AttrDomain::Point, AttributeInitConstruct());
 
-  this->runtime = MEM_new<CurvesGeometryRuntime>(__func__);
-
   if (curve_num > 0) {
     this->curve_offsets = static_cast<int *>(
         MEM_malloc_arrayN(this->curve_num + 1, sizeof(int), __func__));

source/blender/blenkernel/intern/pointcloud.cc

@@ -62,11 +62,11 @@ static void pointcloud_init_data(ID *id)
 
   MEMCPY_STRUCT_AFTER(pointcloud, DNA_struct_default_get(PointCloud), id);
 
+  pointcloud->runtime = new blender::bke::PointCloudRuntime();
+
   CustomData_reset(&pointcloud->pdata);
   pointcloud->attributes_for_write().add<float3>(
       "position", blender::bke::AttrDomain::Point, blender::bke::AttributeInitConstruct());
-
-  pointcloud->runtime = new blender::bke::PointCloudRuntime();
 }
 
 static void pointcloud_copy_data(Main * /*bmain*/,