This is because of the slug lenght, it should be 20 chars max
"Make sure your custom post type identifier does not exceed 20 characters as the post_type column in the database is currently a VARCHAR field of that length."
https://developer.wordpress.org/plugins/post-types/registering-custom-post-types/#:~:text=Make%20sure%20your%20custom%20post,being%20used%20by%20WordPress%20core.
