Adding Markers to the bubble layer makes the whole map flicker/redraw every time

We have a map tile layer and are trying to show the growth of our locations by programmatically adding makers to the array used by the bubble layer on a timed interval.  And it "works" but every time we update the array of markers, the entire map redraws or flashes or something.  Is that avoidable?  In the code below displayMarkers() is a computed signal that returns an array of markers depending on where we are in the chronological progression.