Creating pages like "1.1 test" having a dot in their title fails (even in WebHome), first creating them without the dot and renaming them afterwards however succeeds.
It fails with "Document xwiki:Main.WebHome can not be created, because the name doesn't respect the naming strategy of the Wikis. Change the name or move the parent element in another section."
despite having a default renaming strategy enabled in the admin interface which at least in the admin interface correctly replaces the the dots with "-", see:
While when first creating the pages without dots in their title and then renaming them afterwards works as expected: