Why is there a index.php in my routing?

Hi all,
I am new to CI for like half a year and working on my second project using it. I wonder about one thing:
My "normal" routing works well, domain.tld/page1 etc, Apache is set up to drop the index.php
But when I use something like

PHP Code:

return redirect()->route('page1') 


the redirects are always going to index.php/page1
Why is that (and how to prevent it)?

If you don't want to include index.php in your site URIs, set $indexPage to '' in the app/Config/App.php file.
The setting will be used when the framework generates your site URIs.

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

Ah, this is what I forgot... Thank you!

I sent a PR to improve the user guide:
https://github.com/codeigniter4/CodeIgniter4/pull/7873

Can someone review it?

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper