OMERO import of directory with `DICOMDIR` behaves unexpectedly

[melissalinkert]

A directory import of https://downloads.openmicroscopy.org/images/DICOM/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/ results in two Images, where only one is expected.

$ omero import -f PARNED-0BNNF4_B2_Q30/
...
2025-11-06 17:04:22,124 8453       [      main] INFO      ome.formats.importer.ImportCandidates - 8 file(s) parsed into 2 group(s) with 2 call(s) to setId in 7686ms. (7690ms total) [0 unknowns]
#======================================
# Group: /mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_1 SPW: false Reader: loci.formats.in.DicomReader
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_1
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_0
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_2
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_3
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_4
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_6
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_5
#======================================
# Group: /mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DICOMDIR SPW: false Reader: loci.formats.in.DicomReader
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DICOMDIR
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_0
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_2
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_3
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_4
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_1
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_6
/mnt/bioformats_test_data/automated-tests/curated/dicom/public/wsi/2023-04-28/PARNED-0BNNF4_B2_Q30/DCM_5

Only the second group of files is expected, since that is the minimum number of groups to cover all files in the directory. Suspect this is something to do with how DICOMDIR files are treated in DicomReader, but this requires more investigation.