I have this strange behaviour on my local drupal9 instance. I start it in the
web folder with the build in php development server:
php -S localhost:8000
Now if I try to edit any paragraphs field, eg.
[Fri Aug 13 12:47:39 2021] 127.0.0.1:55544 : POST /admin/structure/paragraphs_type/manual_news/fields/paragraph.manual_news.field_news_entries - No such file or directory
I get a 404 from the server. If it runs on a real webserver, it works.
Anybody knows how to debug / fix this?
I also opened https://www.drupal.org/project/paragraphs/issues/3228039 for this issue.