Missing colors in heatmap if values are the identical

Hello!
when creating a heatmap where values are all the same on a continuous scale, I get the expected colors from ggplot. However, when I put my ggplot into ggplotly, the colors are gone and it's all gray. Only happends, when values are identical. Happens with version 4.9.3 of plotly.

library(ggplot2)
library(dplyr)
library(plotly)

data <- tibble(hour = c(1, 1, 2, 2), day = c(1, 2, 1, 2), evaluation = c(1, 1, 1, 1))
g <- ggplot(data = data, mapping = aes(x = hour, y = day))
g <- g + geom_tile(aes(fill = evaluation), color = "white")
g <- g + scale_fill_gradientn(limits = c(0, 1), colours = c("red", "green"), name = "Availability")

print(g)         # ok, all colors are green as expected
print(ggplotly(g)) # not ok, colors in heatmap are gray, expected to be green

Please let me know if you need more explanation or additional information to track this down.

Thank you and kind regards,
Heiko

Inizia con l’esempio R riproducibile nell’issue e segui la conversione ggplotly per una heatmap continua i cui valori di valutazione sono identici. Confronta gli output di ggplot e ggplotly, quindi verifica che le celle convertite usino il colore verde previsto invece del grigio.