Logging out does not unlock pages that were being edited

Steps to reproduce

• As Admin, edit home page in wysiwyg
• In a distinct session, as user "Test" allowed to edit, try to edit home page: the user is warned that the page is currently locked
• As Admin, log out
• As Test, try again to edit home page

Expected result

Since user Admin has logged out, the page should not be considered as locked. Or is it a feature that we want to consider there might be unsaved content in the page that the user Admin will save later on by logging in again before saving?

Actual result

The home page is still marked as locked while user has logged out.

Note that this can be an issue in particular for XWiki.XWikiPreferences, since it seems there is no easy way to unlock that page expressly.