[GH-ISSUE #2721] Bug: Workflow connections broken in nested subgraphs when loading via Electron UI #1021

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opened 2026-10-27 21:25:05 +00:00 by bsakaguchi · 0 comments

bsakaguchi commented

2026-10-27 21:25:05 +00:00

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Originally created by @aurel-tales on GitHub (Mar 21, 2026).
Original GitHub issue: https://github.com/Comfy-Org/ComfyUI-Manager/issues/2721

Description
When loading a workflow containing nested subgraphs through the Electron UI loader, connections appear intact after loading. However, when launching a generation from the root level, connections inside the innermost subgraph get broken. The same workflow behaves correctly when:

Dragging and dropping a PNG image with the workflow embedded in its metadata
Loading the workflow via the browser at http://127.0.0.1:8188

This issue appeared after the last update.

Steps to reproduce

Open a workflow containing nested subgraphs via the Electron UI workflow loader
Connections appear correct at this stage
Enter the parent subgraph and run the generation → it works correctly
Go back to the root level and run the generation → connections inside the nested subgraph break at that moment

Expected behavior
Connections should remain intact regardless of the level from which the generation is launched.

Actual behavior
Connections inside nested subgraphs are intact after loading but break at the moment generation is launched from the root level via the Electron UI. The graph is likely not being flattened correctly when serialized for the backend from the root context.

Workaround

Load the workflow by drag & dropping a PNG image generated with that workflow
Use the browser interface at http://127.0.0.1:8188 instead of the Electron UI

Environment

ComfyUI Desktop (Electron)
Issue does not occur on the portable version with the same ComfyUI version and custom nodes

Originally created by @aurel-tales on GitHub (Mar 21, 2026). Original GitHub issue: https://github.com/Comfy-Org/ComfyUI-Manager/issues/2721 **Description** When loading a workflow containing nested subgraphs through the Electron UI loader, connections appear intact after loading. However, when launching a generation from the root level, connections inside the innermost subgraph get broken. The same workflow behaves correctly when: - Dragging and dropping a PNG image with the workflow embedded in its metadata - Loading the workflow via the browser at `http://127.0.0.1:8188` This issue appeared after the last update. **Steps to reproduce** 1. Open a workflow containing nested subgraphs via the Electron UI workflow loader 2. Connections appear correct at this stage 3. Enter the parent subgraph and run the generation → it works correctly 4. Go back to the root level and run the generation → connections inside the nested subgraph break at that moment **Expected behavior** Connections should remain intact regardless of the level from which the generation is launched. **Actual behavior** Connections inside nested subgraphs are intact after loading but break at the moment generation is launched from the root level via the Electron UI. The graph is likely not being flattened correctly when serialized for the backend from the root context. **Workaround** - Load the workflow by drag & dropping a PNG image generated with that workflow - Use the browser interface at `http://127.0.0.1:8188` instead of the Electron UI **Environment** - ComfyUI Desktop (Electron) - Issue does not occur on the portable version with the same ComfyUI version and custom nodes

bsakaguchi closed this issue

2026-10-27 21:25:05 +00:00