I downlooaded the July testbuild (siduction-2025.1.0-Shine_on-kde-amd64-202507011840.iso 2025-07-01 20:49) tonight and attempted to install it in a VM. It installed fine, but failed to boot after installation. I tried with and without EFI enabled. Got the same error with both installs, You need to load the kernel first.
The one I have downloaded siduction-2025.1.0-Shine_on-kde-amd64-202503241412.iso installs and boots just fine.