Top key missing in guide_bins when reverse = TRUE

[petrbouchal]

This seems to be a regression/reappearance of #4210

Reprex:

library(ggplot2)
df <- data.frame(a = 1:100, b = 1:100)

ggplot(df) +
  geom_point(aes(colour = b, x = a, y = b)) +
  guides(colour = guide_bins(reverse = T))

^{Created on 2024-11-13 with reprex v2.1.1}