This problem arose with the introduction of Django 4.0 when they added functionality. See: https://docs.djangoproject.com/en/5.0/releases/4.0/#template-based-form-rendering
The following tests in dcolumn/dcolumns/tests/test_dcolumns_forms.py fail: test_validate_choice_relation test_validate_pseudo_choice_relation test_validate_stored_relation test_validate_data test_validate_time test_validate_datetime test_validate_float test_validate_integer test_validate_text_block
As of now 2024-05-05 I do not know what the fix needs to be. As of now there is very little usage of this Django plugin so it is at the bottom of my list to fix. If someone is able to find the issues please send a PR or at least let me know by email.
carl dot nobile at gmail.com