src/Queries/UserQuery.php
protected function normalizeFilter()
    {
        $this->substituteField($this->filter, 'GROUPS', 'GROUPS_ID');
        $this->substituteField($this->filter, 'GROUP_ID', 'GROUPS_ID');

        return $this->filter;
    }
protected function normalizeFilter()
    {
        $this->substituteField($this->filter, 'GROUPS', 'GROUPS_ID');
        $this->substituteField($this->filter, 'GROUP_ID', 'GROUPS_ID');

        return $this->filter;
    }
Normalize filter before sending it to getList.
This prevents some inconsistency.

@return array