php - Symfony Form value not flushing with Selectpicker class

In Symfony 4 form I have a form field declared with EntityType:

public function buildForm(FormBuilderInterface $builder, array $options)
{
     $builder->add('tags', EntityType::class, array(
                'class' => Saptag::class,
                'choice_label' => 'descr',
                'required' => false,
                'multiple' => true,
                //'attr' => ['class' => 'selectpicker']
     ));
                ...
}
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When form is submited my database is well updated. If I activate class 'selectpicker' then my field has the rendering I need in the template but field value do not update database when this class is used. No error occurs...

Any idea of how to handle that ?

EDIT: This issue occurs when form is placed crossed div element:

<div>
</form>
</div>
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