add_action( 'save_post', array( $this, 'save_metabox', 10, 2 ) );
should be
add_action( 'save_post', array( $this, 'save_metabox' ), 10, 2 );
If you enable debugging, you’ll see a call_user_func_array
error generated by this.
Also, a few other things-
You should check if $_POST['anotai_nonce']
is set before trying to use it in assignment on the first line of your save_metabox
function.
You don’t need to json encode the data, arrays will get serialized/unserialized automatically and can be passed directly to the post meta functions.
If you prefix the meta key with an underscore, it’ll be hidden from the default Custom Fields meta box.
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