Wan2.1 VAE upscale node doubles resolution before sampling in ComfyUI workflow
themofostarboi_v2 · reddit · 2026-10-11
A Reddit user building a 2K-generate-then-4K-upscale workflow found that the Wan2.1 VAE upscale model upscales the latent before it reaches the KSampler, so combined with a post-sampler latent upscale the resolution doubles twice. Swapping back to the standard Qwen image VAE behaves normally. The post asks how to route nodes so the 2x VAE upscale only fires at the end of the pipeline.
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