Filament Relation Manager - Form Not Updating

public function form(Form $form): Form
    {
        return $form
            ->schema([
                Forms\Components\Select::make('user_id')
                    ->multiple()
                    ->preload()
                    ->relationship('mustReadUsers', 'name')
                    ->searchable(),
                Forms\Components\TextInput::make('test')
                    ->label('New field'),
            ]);
    }