Ah, then the column is just bugged. This has been happening for as long as I have been working with Lacerte. The DATA6 and DATA7 tables will always match what Lacerte shows in-product. If the column isn't showing in Lacerte, but they DO have Form 8606, try to unlock the return and go to Client > Update Client Database.

That should update the column in Lacerte and when you query via the API.

Don't know why it happens. Tried to contact Lacerte about it in the past, but didn't get it fixed. Sometimes the columns just don't get updated when the return is calculated.