filter

Field/Filter/AssociationFilter.php

     public function applyFilter(RepositoryQueryInterface $repositoryQuery, FieldDto $fieldDto, $filteredValue = null)
     {
         $fieldProperty = $this->getFieldProperty($fieldDto);
-        if ($filteredValue !== null) {
 
-            if ($fieldDto->getFormTypeOption('multiple')) {
+        if ($filteredValue !== null) {
+            if ($fieldDto->getFormTypeOption('multiple') || ($fieldDto->getTemplatePath() != null && str_contains($fieldDto->getTemplatePath(), 'association_many'))) {
                 $repositoryQuery->andWhere(':' . $fieldProperty . ' MEMBER OF .' . $fieldProperty . '');
             } else {
                 $repositoryQuery->andWhere('.' . $fieldProperty . ' = :' . $fieldProperty . '');