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Reverting to PHP 7.4 does resolve the issue.
However, the original site was built in PHP 8.3 and I can make the same changes on that site with no problem.

Please advise.

I have resolved the previous issue.

Now I am trying to add a custom field for any custom post type registered with metabox.

If I hardcode the values of postTypes vendor and home in the array it works fine.
However, I can't figure out how to query an array of all postTypes that exist. Please advise.

`
add_action('admin_init', 'prefix_add_custom_columns', 20);

function prefix_add_custom_columns() {
require_once 'custom-admin-columns.php';
$post_types = ['vendor';'home'];
if (!empty($post_types)) {
foreach ($post_types as $post_type) {
// Apply custom admin columns to each post type
new Prefix_Custom_Admin_Columns($post_type, []);
}
}
}
`

The issue actually turned out to be that all the items need to be part of a tab. I was thinking that I could have some items outside of all the tabs so I didn't have a tab at the very top. That is what caused the issue.

I am confused.
Is the documentation incorrect?

How do I solve for this?

That is really strange. I swear I didn't change anything but it is definitely no longer there.
You can delete this.