When running a smooth timelapse the printhead moves to the waste chute and pauses for the video frame to be captured.
With a single color print, the printhead then returns to the model and continues printing. But on a multi color print, the printhead moves to the last point on the model that was printed on the prior layer for just a moment before it then moves to the prime tower and does whatever priming pass is needed.
If the filament is even a little oozy, with the pause for the video frame grab, a small amount of filament extrudes itself. When the printhead moves to the model prior to moving to the prime tower, it leaves that whisker on the print.
Nothing can be done about this for a single color print unless prime tower is enabled, without adding a wipe after the frame grab, which would slow down the print time even more. But When running smooth timelapse with a prime tower, after the pause to grab the video frame, the printhead should move to the prime tower without first moving to and contacting the print.
Deposit any “whiskers” on the prime tower and not the model being printed.