diff --git a/src/main/runtime/rpc/methods/orchestration-send.test.ts b/src/main/runtime/rpc/methods/orchestration-send.test.ts
index afcac1d13ae..d8a4212dbef 100644
--- a/src/main/runtime/rpc/methods/orchestration-send.test.ts
+++ b/src/main/runtime/rpc/methods/orchestration-send.test.ts
@@ -250,6 +250,45 @@ describe('orchestration RPC methods', () => {
       expect(accepted.lifecycle.action).toBe('completed')
     })
 
+    it.each(['escalation', 'decision_gate'] as const)(
+      'fences a replacement process from a %s mutation',
+      async (type) => {
+        setup()
+        const task = db.createTask({ spec: `process-bound ${type}` })
+        const dispatch = db.createDispatchContext(
+          task.id,
+          'term_worker',
+          'tab_worker:leaf_worker',
+          undefined,
+          'runtime_test:term_worker:1'
+        )
+        vi.mocked(runtime.getTerminalPaneKey).mockImplementation((handle) =>
+          handle === 'term_worker' ? 'tab_worker:leaf_worker' : coordinatorPaneKey
+        )
+        vi.mocked(runtime.getTerminalProcessIncarnation).mockReturnValue(
+          'runtime_test:term_worker:2'
+        )
+
+        const rejected = (await call('orchestration.send', {
+          from: 'term_worker',
+          subject: `${type} after replacement`,
+          type,
+          payload: JSON.stringify({
+            taskId: task.id,
+            ...(type === 'decision_gate' ? { question: 'Proceed?' } : {})
+          })
+        })) as { lifecycle: { action: string; code: string } }
+
+        expect(rejected.lifecycle).toMatchObject({
+          action: 'rejected',
+          code: 'sender_not_assignee'
+        })
+        expect(db.getTask(task.id)?.status).toBe('dispatched')
+        expect(db.getDispatchContextById(dispatch.id)?.status).toBe('dispatched')
+        expect(db.listGates({ taskId: task.id })).toHaveLength(0)
+      }
+    )
+
     it('rejects an identity-less lifecycle send resolved through the coordinator handle', async () => {
       setup()
       const task = db.createTask({ spec: 'work' })
diff --git a/src/main/runtime/rpc/methods/orchestration.ts b/src/main/runtime/rpc/methods/orchestration.ts
index 1b876fe1347..c0849c620d5 100644
--- a/src/main/runtime/rpc/methods/orchestration.ts
+++ b/src/main/runtime/rpc/methods/orchestration.ts
@@ -639,9 +639,13 @@ export const ORCHESTRATION_METHODS: RpcMethod[] = [
         const dispatch = routing.dispatchId
           ? db.getDispatchContextById(routing.dispatchId)
           : undefined
-        const lifecycleMessage = msg.type === 'worker_done' || msg.type === 'heartbeat'
+        const dispatchMutationMessage =
+          msg.type === 'worker_done' ||
+          msg.type === 'heartbeat' ||
+          msg.type === 'escalation' ||
+          msg.type === 'decision_gate'
         if (
-          lifecycleMessage &&
+          dispatchMutationMessage &&
           dispatch &&
           (dispatch.capability_hash || dispatch.process_incarnation)
         ) {