package_info() returns NA libpath for loaded package when its libpath is not in current .libPaths()

[slager]

Perhaps naively, I had expected package_info() to tell me where the package was loaded from even if not from any of my current .libPaths().

library(withr)
library(sessioninfo)
library(remotes)

mylib <- tempfile()
dir.create(mylib)

install_github('hadley/genzplyr', force = TRUE, lib = mylib)
#> Using github PAT from envvar GITHUB_PAT. Use `gitcreds::gitcreds_set()` and unset GITHUB_PAT in .Renviron (or elsewhere) if you want to use the more secure git credential store instead.
#> Downloading GitHub repo hadley/genzplyr@HEAD
#> 
#> ── R CMD build ─────────────────────────────────────────────────────────────────
#> * checking for file ‘/tmp/RtmpduYRXt/remotes873fd94ce2fc/hadley-genzplyr-df238ea/DESCRIPTION’ ... OK
#> * preparing ‘genzplyr’:
#> * checking DESCRIPTION meta-information ... OK
#> * checking for LF line-endings in source and make files and shell scripts
#> * checking for empty or unneeded directories
#> * building ‘genzplyr_0.0.0.9000.tar.gz’
library(genzplyr, lib.loc = mylib)
#> genzplyr loaded fr fr 💅
#> Your data wrangling is about to be bussin no cap

test_fn <- function(){
  package_info() |>
    yeet(package == 'genzplyr') |>
    main_character('library') |>
    as.character()
}

# library is NA when loaded path is not currently in .libPaths()
test_fn()
#> [1] NA

# library is resurrected
with_libpaths(mylib, test_fn())
#> [1] "/tmp/RtmpduYRXt/file873fd99593c6"

^{Created on 2025-12-11 with reprex v2.1.1}