meta query multiple values for the same key

I’m trying to query wordpress with multiple values but it looks like it can’t take no more than 4 keywords

I’m currently using a loop and I already tried to switch to a IN operator but I need the query to work with wildcards and while REGEXP does the job, IN does not

foreach ($keywords as $value) {
    $args['meta_query'] = array(
        'relation' => 'OR',
        array(
            'key' => 'customfields',
            'value' => $value,
            'compare' => 'REGEXP'  
        )
    );
}

In this case $keywords is an array of words that I need to query to a custom field. It works with a few keywords, but it breaks with 5 or more.