IP Canonicalization is the technical website issue but it's not affect your website. As per my knowledge IP canonicalization is not fix to your site with 301 redirection rule test, it will consider duplicate content with domain and IP.
For example : If your site's IP 11.11.111.111 and it's does not redirect to your site's domain name. This could cause duplicate content problems if a search engine indexes your site under both its IP and domain name.