Vaadin session expire URL and redundant redirect

Question

I configured my Vaadin 24.4.0.alpha1 application with the following:

server.servlet.session.timeout=30m   
vaadin.closeIdleSessions=true 


@Override
public SystemMessages getSystemMessages(SystemMessagesInfo systemMessagesInfo) {
    var messages = new CustomizedSystemMessages();
    messages.setSessionExpiredURL("/idle.html");
    return messages;
}

After 30 minutes of inactivity, the user is redirected to the 'idle.html' page. Everything is fine here. On this page, I suggest returning to the application by clicking the link https://example.com.

In most cases, everything works well, but sometimes I see a situation where, after clicking this link, the user is redirected to the site and then immediately back to the 'idle.html' page. After clicking the link https://example.com again, the user correctly transitions to the site.

Why could this be happening? Something, somewhere, may be cached, perhaps some cookies that I need to forcefully clear on the session destroy event or invalidate session.. etc?

I cannot consistently reproduce this issue right now, so I request your assistance in locating it