I think this has caused some issues with using label_bquote inside functions. I am trying to use this inside a function e.g.

translator = c('name' ='fancy[name]') # or some other kind of plotmath (e.g. from latex2exp)

fun = function(i) {
    x = data[[i]]
    m = vec[i]

    ggplot(x, aes(x = x, y = y) +
        facet_grid(
            cols = vars(measure),
            labeller = label_bquote(cols = .(translator[m]))
        )
}

Would give an error on not being able to find m - as m is only defined in rlang::caller_env(), not rlang::env_parent().

I changed rlang::env_parent() to rlang::caller_env() in labeller.R and it fixed this issue.

Maybe there should be a way to make both environments accessible to label_bquote?