Polarisation degree vs. rest-frame phase measured from the peak brightness in r/V band. The literature data collected from sources listed in Table 1 are shown with grey markers. The data are in V band (or comparable), apart from SN 2020znr (R). No ISP correction is performed for SN 2018bgv. For SN 2018hti, we performed the ISP correction based on values presented in Lee (2019) and for SN 2018bsz we assume the Case A ISP as presented by Pursiainen et al. (2022). We note the break and scale change in the x-axis at 150 d.