Interestingly, if you visit this page in your local Phorge:

https://we.phorge.it/config/edit/storage.s3.bucket/

You may see that page with a misleading link to S3:

Proposals:

1. The message should be not parsed as Remarkup
2. The "S3" should not be rendered by default without using {S3}
3. All "S<ID>" should not be rendered by default without using {S<ID>}