When the "Always use old.reddit.com" option is enabled, and you click the "View Poll" link at the bottom of a Poll post, it attempts to redirect you to "https://www.reddit.com/poll/" but gets intercepted and redirected to "https://old.reddit.com/poll/" which is invalid.
There needs to be an exception in place for /poll/ URIs.
When the "Always use old.reddit.com" option is enabled, and you click the "View Poll" link at the bottom of a Poll post, it attempts to redirect you to "https://www.reddit.com/poll/" but gets intercepted and redirected to "https://old.reddit.com/poll/" which is invalid.
There needs to be an exception in place for /poll/ URIs.