No matter I chose nvme0 or nvme1 in the installation menu, it keeps installing to nvme1.
I reinstalled 4 times to make sure I am not seeing something wrong.
Any thought please?
Erase both disks. Completely! (If you just delete partitions some signatures may still be present.) Use any rescue image to boot and run something like "dd if=/dev/zero of=/dev/nvem0 bs=1M status=progress" for both of them.
Remove nvme1 during installation. Then there is only one device left to install onto...