Binned late-time observations of the recovered known SNe Ia-CSM. All objects are shown in absolute magnitude and over the same time range for easy comparison. All objects are detected beyond 100 days after the peak without using the binning technique. We do not show these individual data points to increase readability. The tail fits are shown as solid lines with the hashed region denoting their 1σ uncertainties. For comparison, SN 2020ssf (ZTF20abyptpc) in the top left corner is a normal SN Ia with a normally declining tail with t_1/2, g = 53 ± 1 days and t_1/2, r = 26 ± 1 days. The fitted tails for the SNe Ia-CSM are significantly shallower.