I also tried to record on the buffer a few months ago and couldn't (still can't) so I just assume that you can't do that, and do not think they will have a update/fix to do a record on buffer.
I never tried to do a buffer recording before a few months ago so I don't know if you were able to do it last year or any other time. I know this is of no help I just wanted to state my experience on the buffer recording.
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