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

Comienza con el ejemplo reproducible en R del issue y sigue la conversión de ggplotly para un mapa de calor continuo cuyos valores de evaluación son idénticos. Compara las salidas de ggplot y ggplotly y verifica después que las teselas convertidas usan el color verde esperado en lugar de gris.