Used Network Image openSUSE-Leap-15.5-NET-x86_64-Build408.2-Media.iso
Downloaded from http://get.opensuse.org/leap/15.5/

Issue: After downloading the repo data, the installer warns ���������To use the
selected repository a matching boot image is needed. Download it now and
restart?���������
If I click on Yes, it looks like the system is restarted with a Leap 15.4 boot
image.

Reason: The repo location used by the 15.5 Network Image is set to
http://download.opensuse.org/distribution/leap/15.4/repo/oss, as confirmed by
looking into installer details (Expert ��������� Show Config) and by checking debug
output on tty3 (which contains only .../leap/15.4/... paths.