Italicizing strip.text with ggplotly

I've been trying to get the labels on a faceted grid to be italicized on the y-axis and can't seem to make it to happen.

Here I'll use the "Free Y Axis" example of a faceted grid as written by Plotly:
https://plotly.com/ggplot2/facet_grid/

The only change I've made to this code is make the strip text for both axes larger and the y-axis text italicized in the ggplot theme().

library(reshape2)
library(ggplot2)
library(plotly)

p <- ggplot(tips, aes(x=total_bill)) + geom_histogram(binwidth=2,colour="white")

# With panels that have the same scaling, but different range (and therefore different physical sizes)
p <- p + facet_grid(sex ~ smoker, scales="free", space="free") +
               theme(strip.text.x = element_text(size = 13),
               strip.text.y = element_text(size = 13,face = "italic"))

p

fig <- ggplotly(p)

fig

The plot produced by ggplot (p) looks like this, with the y-axis facet labels in italics:

The plot produced by ggplotly (fig) looks like this:

Any clarification if I'm missing something would be appreciated. Thank you!

Commencez par l’exemple fourni « Free Y Axis » et comparez l’objet ggplot p avec le résultat ggplotly fig, en vous concentrant sur la manière dont le style du texte des bandes de facettes est converti. Reproduisez le style italique manquant pour les libellés de facettes de l’axe y ; le travail est terminé lorsque ggplotly conserve le style italique tout en conservant le texte plus grand de la bande.