Two subsamples resulting from the subdivision of the main sample, based on their having an over-dense (red) or under-dense (blue) LoS for a given source redshift (shaded colours). Left: Median azimuthally averaged reduced tangential shear contribution from the LoS, calculated as the difference between the reduced tangential shear from the CL+LoS mock and the CL mock, as a function of radius. Right: Median azimuthally averaged residuals, calculated as the difference between the reduced tangential shear from the best-fit model and the CL mock. On average, the residuals for clusters lying along over-dense and under-dense sight-lines are asymmetrically distributed around zero, potentially leading to a bias.