Plugin directory “Last Updated” not changed after initial commit?

I released the first version of my Rewrite analyzer plugin with a commit on 2010-05-12. The ww.wp.xz.cn plugin directory however still displays 2010-11-27 as the “Last Updated” date – this is the date when the plugin directory was created in the repository.

The Developer FAQ states:

Last updated time

Time of last check in to the appropriate directory (trunk/ or the stable tag directory) after a version number change.

Most developers commit their first version right after their plugin directory gets created, so you won’t notice the difference. But I have seen the same discrepancy in other plugins that were committed more than one day after the directory was created.

I committed both the trunk/ and tags/1.0/ directories in one go (with a local copy and then a commit), but the other plugin with this problem did it like most people do: a commit of trunk/ and then a remote copy to tags/1.0/.

Otto recently said:

The only time the readme gets parsed and the entry gets rebuilt is when the version of the plugin changes. However, for people using tags, this generally happens after they make the new tag and update the Stable Tag.

The readme file got parsed, so I don’t know what else I could have done to make it update correctly?

This question was also asked at the WordPress Stack Exchange. I will update both places with new info.