No, it's a slight quirk (other schemes don't behave this way), but the default issue type scheme simply contains all the issues.
It would be nice to be able to define a true default scheme, even if there's still a non-deletable system "list of all of them" somewhere, but we're not there yet. I've a memory of an issue in Atlassian's Jira that we should vote on, but I can't find it at the moment.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.