ggplotly does not show point size legend for geom_point

When using ggploty on a geom_point plot the point size legend is not shown.

Minimal example to reproduce:

library(ggplot2)
library(plotly)

p <- ggplot(mtcars, aes(x = wt, 
                        y = mpg, 
                        size = qsec))
p <- p + geom_point()
ggplotly(p)

Expected output from ggplot:

Ouput of ggplotly:

It does, however, show the color legend.

p <- ggplot(mtcars, aes(x = wt, 
                        y = mpg, 
                        color = qsec))
p <- p + geom_point()
ggplotly(p)

Freshly installed R 4.2.1, plotly_4.10.0 and ggplot2_3.3.6.

Start by running the minimal R example through ggplotly and compare its size legend with the color-legend example. Trace the ggplotly conversion of geom_point aesthetics; done means the generated plot shows a point-size legend while preserving the existing color-legend behavior.