I recorded this in the looper, the first play is with the pitch block enabled, the second with pitch block disabled. Recorded on a Strat neck pickup w/ volume at 7.
K - I can definitely hear it in your clip - I usually use virtual capo with distortion so I guess it is more evident clean. I narrowed the patch down to just Input > looper > pitch > output and tried various tracking options but same thing. It's particularly appearant straight through with no amp/cab block - hear below (no VC on 1st strum, VC on 2nd). Not sure it is a bug though as it may just be the nature of the beast with generated pitch shifted tones - it's one of those fx where even the best of the best does not sound that good to me raw.