From 1fb4d4a2842b2bff2ef92c3ced02122e36b30bcc Mon Sep 17 00:00:00 2001
From: Robert Wojciechowski <hello@robertvoy.com>
Date: Tue, 13 Oct 2026 23:56:35 +0000
Subject: [PATCH] fix: preserve mixed-mode preflight across execution planner
 integration

---
 api/queue_orchestration.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/api/queue_orchestration.py b/api/queue_orchestration.py
index 3faeffb..11b322c 100644
--- a/api/queue_orchestration.py
+++ b/api/queue_orchestration.py
@@ -332,6 +332,10 @@ async def orchestrate_distributed_execution(
                           for node in prompt_obj.values())
     target_kwargs = {}
     if image_list_mode:
+        if any(isinstance(node, dict) and node.get("class_type") in {
+                "DistributedCollector", "DistributedMediaCollector", "UltimateSDUpscaleDistributed"
+        } for node in prompt_obj.values()):
+            raise ValueError("Distributed Image List cannot be mixed with other distributed collectors")
         prompt_obj, outer_targets = prepare_image_list_execution(prompt_obj)
         target_kwargs["partial_execution_targets"] = outer_targets
     prompt_index = PromptIndex(prompt_obj)