Left: Binned light curves in flux space in the SN rest-frame of the three objects with a late time signal that we were not able to follow up on. The three ZTF bands g, r, and i are shown in green, orange, and red, respectively. Individual observations are shown before the binning starts. Bins are shown as coloured blocks showing the size of the bin, mean value, and 1σ uncertainty of the binned observations, with the point showing the mean observation date of the bin. Bins that are > 5σ above zero flux are filled, and bins ≤5σ from zero flux are dashed. Middle: Same plot as on the left but in absolute magnitude, corrected for MW extinction. 5σ detections in individual observations are shown before the binning starts, and the 5σ binned detections are shown in the same way as in the left plots. 5σ upper limits are shown with a downward arrow for the binned non-detections. The gray vertical line shows when the excess was first discovered. Right: PS1 cutouts centred on the SN location, which is marked in red.