Hello Mike, releng, I downloaded the latest stage3 for s390x and I noticed that the default profile is default/linux/s390/13.0/s390x instead of the 17.0 profile. If there is a reason and there are no mistakes, feel free to close.
Looks like everything is fine: root@lgentoo3 0:0 default # ls -lh stage3-s390-latest.tar.xz lrwxrwxrwx 1 root root 35 Jun 5 08:06 stage3-s390-latest.tar.xz -> stage3-s390-20190605T071651Z.tar.xz root@lgentoo3 0:0 default # tar -tvf stage3-s390-latest.tar.xz ./etc/portage/make.profile lrwxrwxrwx root/root 0 2019-06-05 07:36 ./etc/portage/make.profile -> ../../usr/portage/profiles/default/linux/s390/17.0 root@lgentoo4 0:130 default # ls -lh stage3-s390x-latest.tar.xz lrwxrwxrwx 1 root root 36 Jun 20 10:12 stage3-s390x-latest.tar.xz -> stage3-s390x-20190620T091431Z.tar.xz root@lgentoo4 0:0 default # tar -tvf stage3-s390x-latest.tar.xz ./etc/portage/make.profile lrwxrwxrwx root/root 0 2019-06-20 09:43 ./etc/portage/make.profile -> ../../usr/portage/profiles/default/linux/s390/17.0/s390x What are you seeing that suggests that the stages are using 13.0 profiles?
After have download the stage to create a chroot, "eselect profile list" shows me the 13.0 as default
What about "eselect profile show"? stage3-s390-20190605T071651Z.tar.xz /etc/portage/make.profile -> ../../usr/portage/profiles/default/linux/s390/17.0 stage3-s390x-20190620T091431Z.tar.xz /etc/portage/make.profile -> ../../usr/portage/profiles/default/linux/s390/17.0/s390x
Between my report and now there was commit d396d1941f8fb674218683e5fdbb248f2c713f36 that maybe fixed this.