The default English value of [[MediaWiki:Permissionserrorstext-withaction]] is "You do not have permission to $2, for the following reasons:", and the default value of [[MediaWiki:Action-createpage]] is "create pages". When a user tries to create a page but they don't have the correct permissions, these messages are used together to make "You do not have permission to create pages, for the following reasons:".
However, this message is not true for registered users who try to edit a create-protected page. They do have the permission to create pages in general, they just don't have the permission to create that particular page. (That is, unless that particular wiki disallows page creation by non-admin users, or something else funky like that.)
For example, go to this link as a registered non-admin user: https://test.wikipedia.org/w/index.php?title=This_is_just_a_test&action=edit
That will show the message above, but it is still possible to create other pages on testwiki.
Also, on most Wikimedia wikis IPs are allowed to create talk pages, and on enwiki they are allowed to create drafts, which means the message isn't really true for them either.
I see two possible fixes, depending on whether action-createpage is used in messages other than permissionserrorstext-withaction. If it isn't, we can just change action-createpage to "create this page". If it is, we may need to create a new message to use with permissionserrorstext-withaction.
I've brought this up on enwiki's village pump too, but no responses so far: [[WP:VPT#Action-createpage]].
Version: 1.23.0
Severity: minor