Will traefik renew custom certificates?

When transferring a domain to a new server, traefik will start requesting certifcates immediately it is configured, which can cause the server to be blocked by letsencrypt servers.

So I figure I could setup the certificates from the old server as custom certificates at the new server, so it will not request certificates, but ssl will work as soon as the dns changes propagates.

But will traefik try to update the custom certificates when they are about to expire?

Or should I just remove the custom certificates from the config when I'm sure the dns has propagated everywhere (after the TTL has expired)?

From just the other day. Here is what I did, it worked out okay.