This bug was fixed in kernel version 6.1.33 by commit e8631d84c01ece34670af0d300a6f88d86d12f70. I compiled from source and confirm that the problem is indeed fixed in 6.1.33.
The root of the problem is that the "family" in the SMBIOS is "Lenovo ThinkSystem HR330A/HR350A" not "eMAG", so a workaround broken SetVirtualAddressMap() is not applied. I now see that this bug applies to more than installer, that just happened to be where I first was blocked by it. I'm not sure if I can/should reclassify this bug report to the kernel package.