Hi Elias,
Thanks for using Shortcoder.
When a shortcode is missing the “name” attribute it will print “shortcode is missing name attribute”. I can see the same on your side.
For somereason I guess the “name” attribute is stripped while saving the post? Please use the “shortcoder” block if you are using block editor.
Please share a screenshot of the usage if issue persists.
Thanks,
Aakash