@phanlt You’re right, it is still not working and I am also waiting for the Plugin’s Author reply to fix this issue.
I tried to fix it myself by turning off the CloudFlare CDN Support and deactivating my Caching plugin (wp-rocket), but still, the issue was not fixed.
I even tried to roll back to the previous version of the plugin but still, it doesn’t work.
The strange thing is the Poll works for the logged-in users even after removing the modifications that the Plugin’s Author provided above.