[Avodah] What is the source for the minhag of Chasidim to have HaKafos on Shmini Atzeres night?

[SBA]

From: "Prof. Levine" <>
Have a look at Chapter 30 of R. A. Ya'ari's sefer Toldos Chag Simchas 
Torah (page 267). There you will see that due to a mistake in 
transcription, people were under the impression that the ARI danced 
in front of the Sifrei Torah on Shmini Atzeres night. However, he 
actually danced on Motzoei SA after Maariv.
It seems to me that this error in transcription is the "basis" for 
what Chassidim do.
>>

WADR, Yaari is writing a naarishkeit.
To have even a hava amina that the "basis" of a minhag practised by 
tzadikim and kedoshim and thousands of their followers over centuries 
is "due to a mistake in  transcription" is ludicrous and mischievous.

SBA