Just downloaded and verified the big tumbleweed install iso.
dd onto a usb memory.
Booted, clicked through installer everything pretty default.
As soon as everything is set and I click install, the installer is startet again in a less graphical mode. Where I choose source medium and repo and graphical again, to see the installer I just clicked through yet again. No attempt at actually installing was made. The target disk is still empty,
The disk wasn’t empty. At the exact offset where the installer made a partition, there was the remnant of a LUKS+Integrity header. For some reason this header failed an installer module silently. And the installer silently would not actually install. After a secure erase that made all logocal blocks 0, it works.