[Bug] Vulkan img2img returns white image

[StudenteChamp2]

Tested with master-707-5a34bc7 build.

Test image:

CPU output:

Vulkan output:

I downloaded the models on the internet:
https://huggingface.co/unsloth/Qwen3-4B-GGUF/blob/main/Qwen3-4B-UD-Q4_K_XL.gguf
https://huggingface.co/unsloth/FLUX.2-klein-4B-GGUF/blob/main/flux-2-klein-4b-Q8_0.gguf
https://huggingface.co/black-forest-labs/FLUX.2-small-decoder/blob/main/full_encoder_small_decoder.safetensors

Operating System & Version

Windows 11

GGML backends

Vulkan

Command-line arguments used

sd-cli.exe --backend vulkan0 --diffusion-model flux-2-klein-4b-Q8_0.gguf --llm Qwen3-4B-UD-Q4_K_XL.gguf --vae flux2.full_encoder_small_decoder.safetensors --vae-conv-direct -p "turn the image into a high quality photograph" -r Albedo.png -o output_photo.png --cfg-scale 1 --steps 4 --fa

Steps to reproduce

Simply run the command with the attached "Albedo.png" image as reference input.

What you expected to happen

A realistic output like mentioned in the prompt.

What actually happened

White render!

Logs / error messages / stack trace

No response

Additional context / environment details

No response