"dp.events.update(dpEvent)" sometimes redraw all Events on a Calendar

I have an issue on a specific page and I’m unable to find the cause. On the click of a button, I update the HTML of an Event on a Calendar. Something like:

const dpEvent: DayPilot.Event = dp.events.find((ev) => ev.id() === idToFind);
dpEvent.data.html = dpEvent.data.html + '<span>test</span>';
dp.events.update(dpEvent);

For some reasons, on that specific page, all the Events are redrawn on the Calendar when this code is ran so they all flicker! I have another page where I do something very similar and only the target Event is redrawn (perfect behavior).

Do you have an idea what could cause dp.events.update(dpEvent) to redraw all Events?

Note that it may certainly be something on my side. I’ll do more tests and try to isolate the issue as much as possible but, if you have any idea, it would be appreciated.