Some objects cannot be evaluated about patchnets

[QtEngineer]

I print all attributes and found .obj files loaded by trimesh does not contain attr 'vertcis'
['abstractmethods', 'add', 'class', 'delattr', 'dict', 'dir', 'doc', 'eq', 'format', 'ge', 'getattribute', 'gt', 'hash', 'init', 'init_subclass', 'le', 'lt', 'module', 'ne', 'new', 'radd', 'reduce', 'reduce_ex', 'repr', 'setattr', 'sizeof', 'slots', 'str', 'subclasshook', 'weakref', '_abc_impl', '_cache', '_hashable', '_lights', 'add_geometry', 'apply_obb', 'apply_scale', 'apply_transform', 'apply_translation', 'area', 'bounding_box', 'bounding_box_oriented', 'bounding_cylinder', 'bounding_primitive', 'bounding_sphere', 'bounds', 'bounds_corners', 'camera', 'camera_rays', 'camera_transform', 'centroid', 'convert_units', 'convex_hull', 'copy', 'crc', 'deduplicated', 'delete_geometry', 'dump', 'duplicate_nodes', 'explode', 'export', 'extents', 'geometry', 'geometry_identifiers', 'graph', 'has_camera', 'is_empty', 'is_valid', 'lights', 'md5', 'metadata', 'rezero', 'save_image', 'scale', 'scaled', 'set_camera', 'show', 'subscene', 'triangles', 'triangles_node', 'units']