Unfortunately, I cannot reproduce any of the issues.
Assuming you are editing a single post template for your “Werkstätten” posts:
Did you set anything in the “populate content” settings of the template? If not, that’s probably the reason why it isn’t working as expected. If you have set something there: are you sure that the post meets the criteria (e.g. that it has child posts)?
Thank you for your feedback.
Actually I’m not editing a template of the single post, but the single post itself directly in Bricks, because they all look a bit different.
I did some more testing and found that child of: {post_id} does not work while e.g. child of: 431 (the ID of the post) works fine in the backend. Also excluding a specific post works fine but the option “exclude current post” does not.
So I’m assuming these dynamic options are only for templates (when you select content to populate it) but not for single post / pages?