Individual marker styling inconsistent

Hi, thank you for making and working on such a wonderful plotting package.

For one of the projects I'm working on, I'm trying to style individual markers, however it's inconsistent when trying to target individual markers. For example I want to make the fourth point as full opacity (1) and larger (15) while the others are at 0.2 and size 10. I would expect "sample4" to be at full opacity, but it's "sample3". Am I doing something wrong?

test_data <- data.frame(
    x_data = c(2.8113, 5.8112, 7.3461, 15.5405, 16.3035),
    y_data = c(2, 2, 2, 6, 3),
    groups = c("group1", "group1", "group2", "group2", "group1"),
    samples = c("sample1", "sample2", "sample3", "sample4", "sample5")
)
plotly::plot_ly(
    test_data,
    x = ~x_data,
    y = ~y_data,
    mode = "markers",
    type = "scatter",
    color = ~groups,
    text = ~samples,
    marker = list(
        size = c(10, 10, 10, 15, 10),
        opacity = c(0.2, 0.2, 0.2, 1, 0.2)
      )
    )

produces the following plot

Thanks a lot in advance!

Reproduce the supplied plot_ly example in the plotly.R repository and inspect how grouped marker vectors are mapped to the plotted points. Compare the displayed marker styling with the requested size and opacity vectors. Done means sample4 receives size 15 and opacity 1 while the other samples receive size 10 and opacity 0.2.