Listed on Jerrygarcia.com with a setlist identical to that of 1986-12-08.
There is an ad for The Stone which shows other bands booked on the 3rd. This ad is displayed on the event page for 1986-11-30 for reference.
Also, the odds of an exactly repeated setlist in consecutive shows in this era are essentially nil.
Most likely explanation: transcription error on a copy of a tape of 1986-12-08 changed an 8 to a 3.