This should be fixed.
The problem was as I described in the comments: We were checking if you had the close/reopen privilege based on whether or not you could reopen that post. Since the returned question was locked, you couldn't reopen it, so you couldn't see the close reasons.
The logic has been simplified to only check if the user has the privilege.
Don't we already have this tag? status-norepro
Even the excerpt is applicable:
Indicates that the site developers were not able to replicate the behavior reported.
but the tag wiki needs some work. I'm essentially proposing to re-purpose that tag to include obsolete bug reports. In both cases, the final status of the bug is 'we won't fix it, but not ...