A provider that raised was treated exactly like one that said "not my
model", so the node fell through and derived a shape for the very model the
provider existed to handle -- and reported success. For H3 at length=124
that is 31 latent frames against a real grid of 37: a 16% shorter video,
with nothing downstream saying anything.
The protocol is now stated: return None for "not mine", and let anything
else raise. Recognition happens before anything that can fail, so an
exception means the model was already claimed, and the node refuses rather
than substituting a generic shape.
execute() had no test at all -- the dispatch between claimed and derived is
the point of the node, and both earlier tests called around it. It now runs
through the real registry, and the refusal test fails against the old
fall-through.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Derived from latent_format where that is possible, which is every
single-tensor model: SDXL, Wan21 and LTXV all come out matching the numbers
core's own nodes compute, including models that ship after this.
H3 cannot be derived and is the reason modules exist. Its latent is a
NestedTensor of a video and an audio branch, its video channel count is not
the latent_channels its format reports, and its length snaps to a frame
grid. So modules/models/minimax_h3 claims it and builds it, importing the
grid from ComfyUI rather than copying a second definition of it.
Nothing outside that folder names a model, and nothing here assumes video:
a 2-D latent format yields an image latent with no branch anywhere.
Modules reach core through modules/_core.py. ComfyUI imports a pack by file
location, so an absolute `import core` in a module resolves under pytest and
not under ComfyUI -- the node then never registers, silently. That cost the
same bug twice, so there is now a test that loads the pack the way ComfyUI
does, in an isolated subprocess whose cwd is NOT the repo. The first version
of that test passed with the bug reintroduced, because cwd was on sys.path.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
