A backend that carries a zero-copy container path lost it: wrap_attn offers
that path only when the OVERRIDE has the attribute, so dropping it selects
the backend, computes the right answer, and never uses the thing the backend
exists for. ComfyUI forwards it in set_model_optimized_attention; now so do we.
An unknown encoder family fell back to stable_diffusion and reported success.
A family mismatch in this project reads as an unrelated fault, so it refuses
and lists what this ComfyUI actually knows.
fp16 accumulation is one flag for the whole interpreter, so a per-node
checkbox cannot mean "this model": a second loader changes the first model's
maths, and loader caching outlives the run. It cannot be scoped, so it is at
least no longer silent -- every transition says what it really covers. The
honest fix is to move it to a machine-level setting.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
