I always get a year-end paystub from the client and tie into the RSU income.  Then tie shares issued to the broker statements as either sold or still held on 12/31/xx.  The brokers are supposed to report this with 100% gain on the 1099-B but then you make the adjustment on the 8949 for W-2 compensation basis.

The Fidelity supplemental info is probably correct.  If there's a loss though, you might check +/-30 days for wash sale adjustments on any newly acquired shares.

Rick