Upper panel: ratios of K$^{*\pm}$/K$^0_{\rm S}$ as a function of $p_{\rm T}$ for low (X) and high (I) multiplicity classes. Predictions for PYTHIA8 - Monash2013 (dashed lines) and EPOS-LHC (continuous lines) are also reported Middle panel: the highest multiplicity K$^{*\pm}$/K$^0_{\rm S}$ ratio divided by the lowest multiplicity one (double ratio). Lower panel: significance of the deviation of the double ratio from unity. The dashed black line indicates a deviation at the $3\sigma$ level. Bars represent the statistical uncertainties, while boxes represent the part of the systematic uncertainty that is uncorrelated between the multiplicity classes.