"group by" fails

I have a question that starts with the results from another question (written in SQL). In the second question, whenever I try to "group by" a certain field (a string type — I think!) the group by fails. I don't get an error; Metabase thinks for a while, then shows me the same results as before — individual rows, as though I had not tried to "group by" at all.

Has anyone else seen this behavior? I have a hunch that for some reason Metabase is not happy with my field type (string? varchar?) and doesn't want to "group by" it, but it's not giving me any error messaging. Thanks!

Hi @smurray
Always post "Diagnostic Info" from Admin > Troubleshooting.
I would highly suggest that you setup "Sample Dataset", so you can show screenshots or videos, if you don't want to show your schema/data.
I'm guessing you're seeing this issue, which was fixed in 0.39.3:

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