Custom posttype content metabox

I think you may be in a recursive loop. if you hooked into save_post that will be triggered again when you call wp_update_post.

you can temporarily remove the hook. Not knowing exactly how you have written the hook the below code is a guess.

remove_action( 'save_post', [ $this, 'saveModel'] );

wp_update_post([
    'ID' => $postId,
    'post_content' => urldecode($_POST[self::INPUT_ID])
]);

add_action( 'save_post', [ $this, 'saveModel'] );

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