manyToMany attach shows without trashed checkbox

[gepopp]

Laravel Version 9.1
Nova Version: 4.2.6
PHP Version: 8.1

I have a manyToMany relation between users and speeches with a pivot table with the columns:

• id
• speech_id
• user_id
• timestamps

the pivot model looks like:

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\Pivot;

class SpeachUser extends Pivot {


    protected $guarded = [];


    public function speech() {

        return $this->belongsTo( Speach::class );
    }

    public function user() {

        return $this->belongsTo( User::class );
    }

}

Relations in the models are declared like:
User (supports soft deletes):

 public function speeches() {

        return $this->belongsToMany( Speech::class )
            ->withTimestamps()
            ->using(SpeechUser::class);
    }

the speech model (supports soft delets):

 public function speakers() {

        return $this->belongsToMany( User::class )
            ->withTimestamps()
            ->using(SpeechUser::class);
    }

in the nova resources the fields are declared as follows:
User:

BelongsToMany::make( 'Speeches', 'speeches', 'App\Nova\Speech' )
                        ->searchable(),

Speech:

            BelongsToMany::make('Speaker', 'speakers', 'App\Nova\User')
            ->searchable()

if i now go to user and click on Attach Speech it shows the "with trashed" chackbox beneath the search field:

same thing the other way arround when i go to a speech and attach speaker,

if i try to add the withoutTrashed() to the BelongsToMany i get the error

Method Laravel\\Nova\\Fields\\BelongsToMany::withoutTrashed does not exist.

Originally posted by @gepopp in #4092 (comment)