I got it. The problem was that I had overridden the application exceptions handle method for rendering custom error pages (where the view names were also custom). I assume this is not a good practice :)
moderator
Nice that you found it, if you want to overwrite the error pages you should create them in: resources/views/errors/ See: https://laravel.com/docs/5.8/errors#custom-http-error-pages
And bonus tip: let the 500 error view be a standalone html page. On that way you prevent almost always that you get an error in creating the error page.
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