[Bug 295556] loader hangs requiring copy_staging workaround

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295556

            Bug ID: 295556
           Summary: loader hangs requiring copy_staging workaround
           Product: Base System
           Version: 15.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ziaee@FreeBSD.org

After upgrading via source from 15.0 to 15.1-RC1, and copying /boot/loader.efi
to both efi loader locations, my loader hangs at boot. Escaping to boot prompt
and booting after "copy_staging enable" works. This is on an alder lake UEFI
laptop with dual gpu and zfs:

Here's my loader.conf:

exec="loadfont /boot/fonts/32x64.fnt"
security.bsd.allow_destructive_dtrace=0
kern.geom.label.disk_ident.enable="0"
kern.geom.label.gptid.enable="0"
cryptodev_load="YES"
zfs_load="YES"
loader_gfx="NO"
autoboot_delay="2"
aesni_load="YES"
coretemp_load="YES"
cpu_microcode_load="YES"
cpu_microcode_name="/boot/firmware/intel-ucode.bin"
hw.nvidiadrm.modeset="1"
hw.nvidia.registry.EnableGpuFirmware="1"
#hw.pci.do_power_nodriver="3"
kern.msgbuf_show_timestamp="2"
kern.msgbufsize="4587520"

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