Web-based Installer Delivers Completely Broken website

Also, when looking at the 'error log' in the document root, there is this:

Uncaught PHP Exception Drupal\Component\Plugin\Exception\PluginNotFoundException: "The "menu_position_rule" entity type does not exist." at ... /docroot/core/lib/Drupal/Core/Entity/EntityTypeManager.php line 139

Thanks, Jim, for reporting!

I confirm
It looks like you are facing issues when you are trying to install, but the composer build was not complated in the right way.
It feels that you did a composer update after the composer create-project

Which OS you are using?
Which PHP version you are using?
What is the max time an max memory in your install?

Also

📌 Move Patches for drupal/scheduler and drupal/field_group to composer.libraries.json Fixed
Add a TEMP patches-ignore to ignore all patches provided by the drupal/schemadotorg module #229

Scheduler 2.0.2 was released on: 19 Apr 2024 by: jonathan1055 →
https://www.drupal.org/project/scheduler/releases/2.0.2 →

The patch for 🐛 SchedulerManager should take an EventDispatcherInterface object, not ContainerAwareEventDispatcher Fixed
Was committed into the release
But this patch is not in Varbase
It is in the Schema.org Blueprints module
Followed with Jacob
Issue 📌 Move Patches for drupal/scheduler and drupal/field_group to composer.libraries.json Fixed
The fix was committed, but did not release yet.
TEMP Ignore his patch in projects.

( waited for a release for one or two days )
Doing this TEMP fix until the new tag release for schemadotorg

Add the following next to "patches": { } in the root composer.json file.

    "patches-ignore": {
      "drupal/schemadotorg": {
        "drupal/field_group": {
          "Issue #3409719: [Drupal 10.2] Deprecated sequence type schema definition":
          "https://www.drupal.org/files/issues/2024-03-26/field_group-issue-3409719-mr-43.patch"
        },
        "drupal/scheduler": {
          "Issue #3437739: [error]  TypeError: Drupal\\scheduler\\SchedulerManager::__construct()":
          "https://www.drupal.org/files/issues/2024-04-06/scheduler-issues-3437739-comment-4.patch"
        }
      }
    }

Issue #3437217 → : Switched to a local patching system using vardot/varbase-patches and cweagans/composer-patches "~2" within Varbase