I've had multiple reports from users that they were unable to create pages, so I just created a test account and confirmed the issue: my test account isn't able to create pages on my wiki.
I don't believe it's a permissions issue: I have just set the wiki settings so that everyone can create pages, and also it doesn't throw any kind of error like "You don't have permission to create this page". It's just that when I hit "save page", the page reloads and shows me the page-editing screen again, and doesn't save.
On my bureaucrat account, I got a "new changes await moderation" notif, but when I clicked it, there was no sign of the page creation attempt and no way to approve it.