Captcha breaks with object cache

Steps to reproduce:
– Add a form with captcha
– Enable an object cache (I’m using redis with wp-redis)
– Go to the page with the form shortcode, first time it works.
– Reload the page, captcha is broken.
– Flush redis cache
– Reload page, captcha is working again.

I guess there is something that is cached in the object cache that shouldn’t be cached.

https://wordpress.org/plugins/wpforms-lite/