diff --git a/services/autoscaling/src/simcore_service_autoscaling/modules/dask.py b/services/autoscaling/src/simcore_service_autoscaling/modules/dask.py
index cf16afc2b5f..65572f52c43 100644
--- a/services/autoscaling/src/simcore_service_autoscaling/modules/dask.py
+++ b/services/autoscaling/src/simcore_service_autoscaling/modules/dask.py
@@ -136,7 +136,8 @@ async def _list_cluster_known_tasks(
 ) -> _DaskClusterTasks:
     def _list_on_scheduler(
         dask_scheduler: distributed.Scheduler,
-    ) -> _DaskClusterTasks:
+    ) -> dict[str, Any]:
+        # NOTE: _DaskClusterTasks uses cannot be used here because of serialization issues
         worker_to_processing_tasks = defaultdict(list)
         unrunnable_tasks = {}
         for task_key, task_state in dask_scheduler.tasks.items():
@@ -153,10 +154,10 @@ def _list_on_scheduler(
                     task_state.resource_restrictions or {}
                 ) | {DASK_WORKER_THREAD_RESOURCE_NAME: 1}
 
-        return _DaskClusterTasks(
-            processing=worker_to_processing_tasks,  # type: ignore[typeddict-item]
-            unrunnable=unrunnable_tasks,  # type: ignore[typeddict-item]
-        )
+        return {
+            "processing": worker_to_processing_tasks,
+            "unrunnable": unrunnable_tasks,
+        }
 
     list_of_tasks: _DaskClusterTasks = await client.run_on_scheduler(_list_on_scheduler)
     _logger.debug("found tasks: %s", list_of_tasks)