I'd like to report an issue I encountered during development. When I set CACHE_STORE to an 'array' in .env, the validation process always failed due to an error in the cache check within the check function. However, the issue was resolved when I changed CACHE_STORE to 'apc' or another suitable option.
.env
Mews\Captcha\Captcha::check
if (!Cache::pull($this->get_cache_key($key))) {
$this->session->remove('captcha');
return false;
}