on ${\rm HJD'} = 6110.8099$ that the event is showing an anomaly by V. Bozza who browsed the OGLE Early Warning System alert webpage, which presents updated OGLE photometry. The alert prompted the follow-up groups to collect additional measurements, which are not analyzed here. It is worth noticing here, that OGLE-IV microlensing strategy in the high cadence fields is to conduct well defined automated experiment with minimum human intervention; thus, the OGLE-IV by definition does not distribute anomaly alerts.

The OGLE observations returned at ${\rm HJD'} = 6113.52784$ and showed the star brightened by $0.3~{\rm mag}$. The following images revealed it was also fading. This made it obvious that the additional peak in the light curve occurred when the Moon was passing close to the event. Further observations were carried out with the standard cadence except that one additional measurement was taken at ${\rm HJD'} = 6113.85679$, i.e., 25 minutes after the previous one, to secure additional data point of the setting lens before reaching the OGLE high air mass limit. This does not significantly affect the microlensing model fitted and thus the analysis can be treated as based on survey-only data. We note that observations of this event were 