I set up a MediaWiki site locally.
When I edit a page at http://127.0.0.1/mediawiki/index.php?title=%E9%A6%96%E9%A1%B5&action=edit , everything goes well.
When I edit a page at http://[::1]/mediawiki/index.php?title=%E9%A6%96%E9%A1%B5&action=edit , then action=submit, an HTTP 500 error is raised. However, the content is correctly saved (including the IPv6 address 0:0:0:0:0:0:0:1).
Version: 1.16.x
Severity: normal