`sec.axis` weird behavior for scale_{x,y}_discrete

[Tiggax]

while trying to create a plot with the help of scale_y_discrete's sec.axis attribute, i am getting weird behavior.

library(ggplot2)
library(stringr)

data <- tibble(
  question = c("A/B", "C/D", "E/F"),
  value = c(.2, .5, .8)
)


data |> 
  ggplot(aes(x = value, y = question)) +
  geom_point() +
  scale_y_discrete(
    labels = \(x) {str_split_i(x,"/",1)},
    name = "A",
    sec.axis = dup_axis(
      labels = \(x) {str_split_i(x,"/",2)},
      name = "B"
    )
  )

I've been trying to create plots for questions favorbility. and tried using the latest main using seeing that #5620 was merged.

The second axis labels do not get the same value provided to scale_y_discrete's labels function.
what instead is passed to the second label is a vector of numbers.

Is this intended behavior?

[teunbrand]

This issue mirrors #6089 in some ways, but yes: secondary breaks are numeric, so labelling functions will have to deal with this. The reason the breaks are numeric is because that way you're free to place them anywhere instead of just at the primary axis locations.

[teunbrand]

Closing this as a duplicate of #6089.