ggplotly tool tip disappearing for some points

Developing a Shiny app in R3.6.3 with ggplotly version4.9.2.

Plotting a scatter plot from ggplotly with tooltip of each point.

As the tool tip for each point grows larger (more rows), the points toward the top of the graph lose the tooltip even if the tool tip is the same for each point.

If the tooltip is the same, why do some points lose the tool tip and others can display it?

In the code below vary numRows or the size of the plot and points from top towards the bottom lose the tooltip.

numRows = 20

ggiris <- ggplot(data = iris,
                 aes(x = Petal.Width,
                     y = Sepal.Length,
                     color = Species,
                     text = paste(rep(LETTERS, length.out = numRows), collapse = "<br>"))) +
  geom_point()

ggplotly(ggiris, tooltip = "text")

Start by running the provided R ggplotly example and vary numRows and the plot size to reproduce the missing tooltips. Trace how ggplotly renders large tooltip content for points near the top of the graph; done means every point retains its tooltip when the tooltip text is identical.