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I got a bit curious and had a play. If the reference group is generated with you add the field to a table, then it should work.
Is this what you are seeing?
Is the dialog also broken? I.e. can you see the reference group.
My best guess is that it's either a cache issue, or a full compilation of the model is needed.
These are my example classes:
André Arnaud de Cal... 291,359 Super User 2024 Season 2
Martin Dráb 230,370 Most Valuable Professional
nmaenpaa 101,156