There is definitely something wrong, but that should not be it. Oddly enough, the mmCIF file from EBI shows this instead:
loop_ _pdbx_struct_assembly_gen.assembly_id _pdbx_struct_assembly_gen.oper_expression _pdbx_struct_assembly_gen.asym_id_list 1 1 B,H 1 2 C,I,A,E,G 2 3 A,E,G 2 2 D,F,J,B,H Are we talking about the same file? In any case, it is most certainly a bug. This will fix it, at least temporarily: load *4opj filter "NOAUTHORCHAINS;biomolecule 1" ​Bob
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