ComfyUI - disappearing workflows

Users in the r/StableDiffusion community have reported a known issue where ComfyUI workflows disappear or are lost after updating the application or installing new custom nodes, with the UI reverting to a generic default workflow and previously saved work becoming unrecoverable. Users have described losing all saved workflows in ComfyUI after updating or installing new custom nodes and the consequent UI reload after restart, losing multiple hours of work. A saved workflow may appear durable as a JSON file on disk, but ComfyUI workflows are only stable if the surrounding environment stays compatible, as custom node developers frequently publish new versions that can break existing workflows. The recommended mitigation is to regularly export workflows as JSON files externally and to keep ComfyUI core, its frontend package, and all custom nodes updated together to minimize compatibility drift.

What is the 'Unload Models and Execution Cache' from the ComfyUI menu doing that all the other model and cache-clearing nodes I've tried don't do?
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Source: local-ai

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