The Load3D node has stopped working since version 1.32.1

[Raykosan]

Prerequisites

• I am running the latest version of ComfyUI
• I have searched existing issues to make sure this isn't a duplicate
• I have tested with all custom nodes disabled (see how)

What happened?

The Load3D node has stopped working since version 1.32.1. Error when accessing the "lineart" attribute

1.32.5 broken
1.32.4 broken
1.32.3 broken
1.32.2 broken
1.32.1 broken
1.32.0 working

Steps to Reproduce

1. pip install comfyui-frontend-package==1.32.1
2. Use the Load3d node included in the comfy-core package

How is this affecting you?

Workflow won't execute

ComfyUI Frontend Version

1.32.1

Browser

Firefox

Console Errors

got prompt
Using xformers attention in VAE
Using xformers attention in VAE
VAE load device: cuda:0, offload device: cpu, dtype: torch.bfloat16
!!! Exception during processing !!! 'lineart'
Traceback (most recent call last):
  File "I:\ComfyUI-ART\ComfyUI\execution.py", line 510, in execute
    output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "I:\ComfyUI-ART\ComfyUI\execution.py", line 324, in get_output_data
    return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "I:\ComfyUI-ART\ComfyUI\execution.py", line 298, in _async_map_node_over_list
    await process_inputs(input_dict, i)
  File "I:\ComfyUI-ART\ComfyUI\execution.py", line 286, in process_inputs
    result = f(**inputs)
             ^^^^^^^^^^^
  File "I:\ComfyUI-ART\ComfyUI\comfy_extras\nodes_load_3d.py", line 49, in process
    lineart_path = folder_paths.get_annotated_filepath(image['lineart'])
                                                       ~~~~~^^^^^^^^^^^
KeyError: 'lineart'

Prompt executed in 0.22 seconds

Logs

Additional Context

On frontend version 1.32.0 and below, everything works fine.

┆Issue is synchronized with this Notion page by Unito

[dosubot]

Hi @Raykosan! I'm Dosu and I’m helping the ComfyUI_frontend team.

The KeyError for 'lineart' in the Load3D node since version 1.32.1 is due to a regression after a frontend refactor. The frontend and backend now expect different attributes: recent frontend changes removed or conditionally provide the 'lineart' output (especially when animation is enabled), but the backend still tries to access it unconditionally, causing the error. This was introduced in PRs refactoring Load3D and removing 'lineart' output for animation mode, with further changes requiring backend updates to stay compatible (source).

Workarounds are limited: you can manually sanitize PNG metadata, rebuild workflows from scratch, or use an older frontend/core version where loading works as expected (source). For a code-level workaround, you could modify comfy_extras/nodes_load_3d.py to check if 'lineart' exists in the image dictionary before accessing it:

lineart_path = None
if 'lineart' in image:
    lineart_path = folder_paths.get_annotated_filepath(image['lineart'])

There is an open PR to address the broader regression, but it hasn't been merged yet. Keeping frontend and backend versions in sync and adding error handling for missing keys will help avoid this issue until an official fix is released.

To reply, just mention @dosu.

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[jtydhr88]

this is because 3d refactor which removed lineart for now, we need BE change but not merged yet comfyanonymous/ComfyUI#10025,
A temp solution is you can manually copy and paste the source from github to your local

[jtydhr88]

BE changes have been merged, should have no issue if update to the latest