Hi Pascal!
Thank you very much for your reply!
Yes, you are right is WordPress generates the title “Archives:”, “Tag:” and others. Therefore I have added the filter to remove those titles not only from Web Stories but also from all the categories and tags of the theme.
I have tried different options and for my case the filter from before works better. Although of course it can be simplified with your example so that it applies only to the Web Stories plugin.
What it is about archive-web-story.php page. You are also right. I have removed the second filter and WordPress still load it correctly. Although I honestly don’t understand what filter hooks does it?