Labelling with scale_fill_stepsn(): “Breaks and labels are different lengths”

[zoeschindler]

When I use scale_fill_stepsn(), the legend does not show the minimum & maximum value on the legend. When I try to change this by providing a label vector, I get an error “Breaks and labels are different lengths”, although they have the exact same length.
This happend using R version 4.1.0 on Windows 10, using ggplot2 version 3.3.5.
(link to my question on SO)

teunbrand on SO pointed out this issue might be related to the fix of #4423.

This is the plot without changing the labels:

This is the code for with & without changing the labels, including dummy data:

df_test <- data.frame(long = rep(447030:447050, 21),
                      lat = rep(5379630:5379650, each=21),
                      z = rnorm(21*21))
ggplot(df_test) +
  geom_tile(aes(x=long, y = lat, fill = z)) +
  scale_fill_stepsn(
    limits = c(-3, 3), breaks = seq(-3, 3, 1), labels = seq(-3, 3, 1),
    colors = c("#ff6f69", "grey90", "#00aedb"))

Edit: I just needed to use show.limits = TRUE, but I guess the issue with the label argument remains?