Based on the information provided here Six Flags - Pre-Merger Cedar Fair L.P., it appears you were paid for fractional shares that didn't convert to the new Six Flags stock. The amount reported on Form 1099-B represents that payment.
However, since you received stock in Six Flags, you may not have a gain or loss from the sale of your partnership interest. You would need to know how many shares you received and the price of that stock on the day of the conversion.
This is a complicated situation. You may wish to consult with a local tax professional for specific assistance reporting this change in your investment.
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