Parameter "lost_password_link" don't work for self service portal

Hi everyone,
today I wanted to use the parameter “lost_password_link” in config.php for my self-service portal. I noticed that the link “Forgot password?” does not redirect to the desired URL.
If you move mouse over the “Forgot password?” link, the URL is displayed but not opened when you click on it. I think its a bug.
I am currently using Nextcloud 13.
Best Regards