"Create" page (from red link) circumvents Area's "Allowed Prefix Choices" settings
Clicking "Create" atop a non-existing page-page allows for arbitrary Prefix + Area combination, athwart "Allowed Prefix Choices" defined in Area settings.
To recreate.
Given:
. an AreaX which has "Allowed Prefix Choices" narrowed down to, say, exclusively "PrefixA"
. (such that, when in AreaX, if you clicked "Create New>Page", there wouldn't even a be a dropdown for Prefix, it would just show "PrefixA" before the page title box, correctly constraining allowed-Prefixes-upon-page-creation-in-this-Area per settings)
...
1. On whatever other page, make a wiki link from that page to a non-existing page, then save.
2. Click the red wiki link
3. Click "Create"
4. Notice: both the Area and Prefix dropdowns are free selections of all possible, of-themselves-permissible, options.
5. Change the "Save to" (Area) to "AreaX"
6. Change the Prefix dropdown to something other than "PrefixA" (for instance: to another prefix that has been disallowed as an option per Area settings)
7. Fill in the form otherwise, save
8. Notice: it has allowed you to create a page in AreaX with a Prefix other than "PrefixA", to which it should have been constrained per settings?
Expectation/Suggestion: It would not allow you to save a page, as such; that "Allowed Prefix Choices" in Areas would be enforced (if not through the UI, dynamically, which I can imagine would be thorny, etc ... at least on form-submit, as a validation rule to bounce the save on POST)? ... Basically, to be orthogonal ala consistent with the Area->Create New->Page constraints, as such?