Why does my ggplotly histogram have this line, but the ggplot version does not?

General
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1 
mtcars <- mtcars

p <- ggplot(mtcars, aes(x=disp)) + geom_density()
ggplotly(p)

image
image1494×626 40.7 KB

2

ggplot2::geom_density() used to include the outline, but removed it during this release:
Changelog • ggplot2 (tidyverse.org)

I don't know how frequently the ggplotly implementation tracks changes.