Save workflow image blank nodes (missing preview images)

When trying to save a workflow image after recent updates, the images in the workflow are no longer captured, showing blank nodes in the screenshot.

ComfyUI: v0.8.2-21-g5cd111323 (2026-01-11)
Manager: V3.38.1

I also ran pip install for comfyui-frontend-package==1.34.8

This is a screenshot of the workflow in the browser window:

This is the exported image from Workflow Image > Export > png:

I tried in both Chrome and Firefox, with same behavior.

Here's a screenshot of the console panel in Firefox:

Testing with all custom nodes disabled. Trying to avoid having to do a fresh install. Any help is appreciated.

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-8280-Save-workflow-image-blank-nodes-missing-preview-images-2f16d73d36508156a237faabaef635fe) by [Unito](https://www.unito.io)