diff --git a/orchestration/task_orchestrator.py b/orchestration/task_orchestrator.py
index 15915d9f1..58cb22bac 100644
--- a/orchestration/task_orchestrator.py
+++ b/orchestration/task_orchestrator.py
@@ -2,7 +2,7 @@ from typing import Any, Callable, Optional
 from uuid import UUID
 
 from domain.tasks.subtasks import SubTask
-from domain.tasks.tasks import Source, Task, TaskStatus
+from domain.tasks.tasks import Source, Task
 from repositories.tasks.subtask_repository import SubTaskRepository
 from repositories.tasks.task_repository import TaskRepository
 from utilities.private import private
@@ -146,11 +146,10 @@ class TaskOrchestrator:
     @private
     def _cascade(self, task_id: UUID) -> None:
         task = self._tasks.get(task_id)
-        # FAILED is terminal: once any SubTask has failed the Task is failed and
-        # stays failed, so skip the (potentially large) sibling roll-up entirely —
-        # no need to list and re-check the SubTasks.
-        if task.status is TaskStatus.FAILED:
-            return
+        # Always recompute, even from FAILED: a failed batch SubTask may be
+        # re-run (re-sending its own inputs), and its completion must be able
+        # to un-fail the parent (ADR-0055). While any child is still failed,
+        # the recompute keeps the Task failed anyway.
         statuses = [s.status for s in self._subtasks.list_by_task(task_id)]
         task.recalculate_from_subtasks(statuses)
         self._tasks.save(task)