Thank you for your reply.
I tried looking for a way to disable SEV in my BIOS, but couldn’t find any option for it. In fact, I couldn’t find anything related to virtualization, except maybe the IOMMU setting (which is enabled).
I tried downloading the navi14 files and putting them into lib/firmware/amdgpu/ as that is where I found the apparently already installed navi10 firmware. I then used the command sudo update-initramfs -k all -u to update the initramfs. I think that that is all I have to do to manually install the firmware, but I am not sure. I tried looking for a tutorial online, but they all used other methods of installing firmware. Wendell did make a video and forum post about it for the RX 590.
Sadly, none of this solved my issue. The system still hangs at the same point.