Custom Post Type Supports Comments but Shouldn’t

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I registered a custom post type via the register_post_type function. The post type supports

'supports' => array( 'title', 'editor', 'thumbnail', 'revisions' ),

For some reason, the posts have the discussion and comment meta boxes in the editor even though they shouldn’t. I even tried using the ‘remove_post_type_support’ hook to remove comment support to no avail. I already tried testing the twenty-sixteen theme. I have no idea how this is possible. Any ideas? Thanks for any help!