In my experience, most hangs with a message about amdgpu loading on screen are caused by an amdgpu issue of some kind. I'd check to see if amdgpu ends up being loaded correctly via lsmod | grep amdgpu
and just a general journalctl -b 0 | grep amdgpu
to see if there's any obvious failures there. Chances are that even if it's not amdgpu, the real failure is in the journal somewhere.
Could be a wrong setting of hardware.enableRedistributableFirmware
(should be true) or the new-ish hardware.amdgpu.initrd.enable
(can be either really but either true or false might be more or less reliable on your system).