Github Probot: why are pinned issues treated as style and marked as wont_fix?

Question

Using Probot on Github and it is configured like this:

exemptLabels:
  - pinned
  - security
# Label to use when marking an issue as stale
staleLabel: wontfix
...

yet Probot marks pinned issue as "stale" (example). The issue does not have an explicit "pinned" label though?

Answer 1

Seems this is simply not supported and has caused confusion before: https://github.com/probot/stale/issues/192