stable-diffusion.cpp loads the VAE encoder weights only when the ctx is
created with vae_decode_only=false. Our gosd wrapper defaults that flag
to true, and the upstream flux2/flux2-klein code paths don't auto-flip
it (sd_version_is_unet_edit / sd_version_is_control both return false
for VERSION_FLUX2 and VERSION_FLUX2_KLEIN). The CLI compensates by
flipping the flag whenever -r/--ref-image is passed, but on the server
side we don't know that at load time.
Result: requests to /v1/images/generations with `ref_images` against
flux.2-dev / flux.2-klein-{4b,9b} would silently skip the encode step
(first_stage_model.encoder + tae.encoder are dropped at load via
ignore_tensors), and the output had no relation to the reference
image — image-editing was effectively unsupported even though
stable-diffusion.cpp itself supports it.
Add `vae_decode_only:false` to the options of all three flux.2 gallery
entries so the encoder is loaded on first launch. Verified on a live
instance: a 64x64 striped reference image produces an output that
preserves the 3-band layout, confirming the VAE encoder is now wired
through.
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Assisted-by: Claude:claude-opus-4-7 [Claude Code]
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