Thanks for the revised instructions. Based on that, I'm now entering my 1099-K info as "Personal Item Sales", and then in the investment sales section I aggregate the sales into a single entry categorized as Personal Property with proceeds that match the 1099-K and a higher cost basis. I'm entering the description as "Form 1099-K Personal Items Sold at a Loss".
This generates a proceeds entry on Form 8949 that matches the 1099-K ; this 8949 entry gets flagged with "L", which results in a Gain/Loss (column h) of 0. This then carries through to the Schedule D.
I'm probably going to stick with this unless Intuit comes up with a way to make the 1099-K reconciliation/adjustment show up on Schedule 1, lines 8z and 24z. But now at least I have a return that shows in 2 places figures matching the 1099-K income.
