I removed the category slug with Yoast SEO, now my category links lead to a 404 when I am in 'Single page app' frontend mode...
For the 'Single page app' frontend mode, we take the category base that's saved in Wordpress, so it will not work to remove it via Yoast. Of course you can change to the 'Static' frontend mode and it will work fine.
Troubleshooting: Category Slug Shows 404 Page
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