During development of CompareWarp, we started marking entire amps of the HSC camera as defects. The result is that the in image plane is interpolated over vertically, and the mask-bit "BAD" is set.

These "BAD" pixels are excluded from the coadds, however, during the artifact detection stage, these streaks ARE detected and eat up the temporal outlier budget. DM-13637 provided a work around, by prefiltering artifacts with less than some configurable percentage of good pixels. But it's not perfect because the PSF-matched Warp masks do not line up exactly with the direct warp masks. (Some edge defects are leaked into the coadds.)
https://paper.dropbox.com/doc/Ticket-DM-13637-2maw5QNHXlLcs9N24jrxt for more info on DM-13637

This would be improved is SourceDetection knew how to ignore BAD pixel masks while running source detection.