Run callbacks for children within fibers

lib/mongoid/interceptable.rb

@@ -152,7 +152,7 @@ def run_callbacks(kind, with_children: true, skip_if: nil, &block)
     # @api private
     def _mongoid_run_child_callbacks(kind, children: nil, &block)
       if Mongoid::Config.around_callbacks_for_embeds
-        _mongoid_run_child_callbacks_with_around(kind, children: children, &block)
+        _mongoid_run_child_callbacks_with_around_fibers(kind, children: children, &block)
       else
         _mongoid_run_child_callbacks_without_around(kind, children: children, &block)
       end
@@ -186,6 +186,28 @@ def _mongoid_run_child_callbacks_with_around(kind, children: nil, &block)
       end
     end
 
+
+    def _mongoid_run_child_callbacks_with_around_fibers(kind, children: nil, &block)
+      children = (children || cascadable_children(kind))
+      with_children = !Mongoid::Config.prevent_multiple_calls_of_embedded_callbacks
+
+      return block&.call if children.empty?
+
+      fibers = children.map do |child|
+        Fiber.new do
+          child.run_callbacks(child_callback_type(kind, child), with_children: with_children) do
+            Fiber.yield
+          end
+        end
+      end
+
+      fibers.each(&:resume)
+
+      block&.call
+
+      fibers.reverse.each(&:resume)
+    end
+
     # Execute the callbacks of given kind for embedded documents without
     # around callbacks.
     #