Anchor link is wrongly classified as `is_external`

[strixTheCaptn]

Bug description

Adding the following link to my navigation:
/#head-2 (anchor head-2 on home page)
has is_external=true

array:16 [
  // resources/views/partials/nav_item.blade.php

  "entry_id" => Statamic\Fields\Value {
    #raw: null
    #handle: "entry_id"
    #fieldtype: null
    #augmentable: null
    #shallow: false
    -resolver: Closure(...) // Statamic\Structures\AugmentedPage
  }

  "id" => Statamic\Fields\Value {
    #raw: null
    #handle: "id"
    #fieldtype: null
    #augmentable: null
    #shallow: false
    -resolver: Closure(...) // Statamic\Structures\AugmentedPage
  }

  "permalink" => Statamic\Fields\Value {
    #raw: null
    #handle: "permalink"
    #fieldtype: null
    #augmentable: null
    #shallow: false
    -resolver: Closure(...) // Statamic\Structures\AugmentedPage
  }

  "title" => Statamic\Fields\Value {
    #raw: null
    #handle: "title"
    #fieldtype: null
    #augmentable: null
    #shallow: false
    -resolver: Closure(...) // Statamic\Structures\AugmentedPage
  }

  "uri" => Statamic\Fields\Value {
    #raw: null
    #handle: "uri"
    #fieldtype: null
    #augmentable: null
    #shallow: false
    -resolver: Closure(...) // Statamic\Structures\AugmentedPage
  }

  "url" => Statamic\Fields\Value {
    #raw: null
    #handle: "url"
    #fieldtype: null
    #augmentable: null
    #shallow: false
    -resolver: Closure(...) // Statamic\Structures\AugmentedPage
  }

  "children"    => []
  "depth"       => 1
  "index"       => 0
  "count"       => 1
  "first"       => true
  "last"        => false
  "is_current"  => false
  "is_parent"   => true
  "is_external" => true
  "parent"      => null
]

How to reproduce

• Add navigation item
• Set to "/#anchor"
• Dump the item with this snippet:

        <statamic:nav:main as="item">
            @dump($item)
        </statamic:nav:main>

Logs

Environment

$ php please support:details

Environment
Laravel Version: 12.64.0
PHP Version: 8.5.8
Composer Version: 2.10.2
Environment: local
Debug Mode: ENABLED
Maintenance Mode: OFF
Timezone: UTC
Locale: de

Cache
Config: NOT CACHED
Events: NOT CACHED
Routes: NOT CACHED
Views: CACHED

Drivers
Broadcasting: log
Cache: file
Database: sqlite
Logs: stack / single
Mail: smtp
Queue: sync
Session: file

Storage
public/storage: NOT LINKED

Livewire
Livewire: v4.3.3

Statamic
Addons: 4
License Key: Not set
Sites: 1
Stache Watcher: Enabled
Static Caching: Disabled
Version: 6.26.0 PRO

Statamic Addons
captns/statadash-reporter: 0.1.1
marcorieser/statamic-livewire: 5.3.1
reachweb/statamic-livewire-filters: 4.5.1
spatie/statamic-responsive-images: 6.2.0

Installation

Fresh statamic/statamic site via CLI

Additional details

No response