Monitors do not register the finalizer

[Enchufa2]

mon <- simmer::monitor_csv()
rm(mon); invisible(gc())
list.files(tempdir())
#> [1] "file860a546e1118b_arrivals.csv"   "file860a546e1118b_attributes.csv"
#> [3] "file860a546e1118b_releases.csv"   "file860a546e1118b_resources.csv"