There’s a bug in rpm package: https://bugzilla.redhat.com/show_bug.cgi?id=304121

It causes the following error while building rpm packages:

/usr/lib/rpm/debugedit: canonicalization unexpectedly shrank by one
character

As a workaround you can use this command:

rpmbuild -bb rpmbuild/SPECS/package.spec -D 'debug_package %{nil}'

It will disable building of debug package and that’s it.