"Compatibility with WordPress X.X: Unknown" When It Is Known

[dan.rossiter]

On update-core.php, compatibility is not being displayed correctly. Take Akismet as an example. I'm being shown this:

Akismet
You have version 2.6.0 installed. Update to 3.0.0. View version 3.0.0 details.
Compatibility with WordPress 3.8.3: 100% (according to its author)
Compatibility with WordPress 3.9: Unknown

But Akismet is set as compatible up to 3.9. All other plugins are also set as unknown compatibility with 3.9, even if they are listed as compatible.

[collinsinternet]

Update to update-core.php

[collinsinternet]

Last patch was exported incorrectly.

[MikeHansenMe]

Missed the $info-tested check. Patch updated and minor code cleanup

[MikeHansenMe]

Patch still applies with offset.

[wonderboymusic]

In 34322:

Update Core: In list_plugin_updates(), when listing plugin updates related to $core_update_version, don't skip the check for $info->tested.

Props MikeHansenMe.
Fixes #27883.