Eloquent polymorphic return zero but query works in MySql

A difficult question to ask and even harder to find answers for. When I dump the query out to the screen and run in directly in MySql I get the desired results. However executing the code in the project produces zero models.

Migrations

Schema::create('part_base_parts', function (Blueprint $table) {
    $table->increments('id')->index('part_base_parts_id');
    $table->string('code')->nullable();
    $table->boolean('is_web')->default(0);
});
        
Schema::create('part_numbers', function (Blueprint $table) {
    $table->increments('id')->onDelete('cascade')->index('part_numbers_id');
    $table->string('code');
    $table->text('description')->nullable();
    $table->integer('status_id')->unsigned()->default(0);
    $table->foreign('status_id')->references('id')->on('statuses');
    $table->boolean('is_web')->default(0);
});

Models

class PartBasePart extends \App\Models\Base\PartBasePart
{
    protected $fillable = [
        'code',
        'part_type_id',
        'is_web',
        'unit_of_measurement_id'
    ];
    
    public function property()
    {
        return $this->morphMany(PartNumberProperty::class, 'propertable');
    }
}

class PartNumberProperty extends \App\Models\Base\PartNumberProperty
{
    protected $fillable = [
        'part_number_id',
        'propertable_id',
        'propertable_type'
    ];

    public function PartNumberProperty()
    {
        return $this->morphTo();
    }
}

The code that I'm attempting to execute is very simplistic.

Route::get('/test', function() {
    $pbp = App\Models\PartBasePart::find(9);
    echo $pbp->property;
});

The query produced from the above get request is:

select * from `part_number_properties` where `part_number_properties`.`propertable_id` = '9' and `part_number_properties`.`propertable_id` is not null and `part_number_properties`.`propertable_type` = 'App\Models\PartBasePart'

This request produces zero models when I execute from the site. However, if I take the query produced by Eloquent and put it into MySql, it works just fine. Any thoughts as to why? Could it be that I have my models in a sub-folder and I have and issue with "\" in propertable_type? If that was the case then why would the same query work in MySql?