I have the same issue with -71
If I hit CTRL-ALT-DEL after the error and then hit enter it boots. 
Waiting for the 30sec timeout also works.

  Host: --- Kernel: 5.15.0-71-generic x86_64 bits: 64 Desktop: Xfce 4.16.0
    Distro: Ubuntu 22.04.2 LTS (Jammy Jellyfish)
  Type: Desktop System: Micro-Star product: MS-7B09 v: 1.0 serial: N/A
  Mobo: Micro-Star model: X399 GAMING PRO CARBON AC (MS-7B09) v: 1.0
    serial: ---- UEFI: American Megatrends v: 1.C0 date: 11/14/2018
  Info: 16-core AMD Ryzen Threadripper 1950X [MT MCP MCM] speed (MHz):
    avg: 3400 min/max: 2200/3400
  Device-1: NVIDIA TU106 [GeForce RTX 2070 Rev. A] driver: vfio-pci v: N/A
  Device-2: NVIDIA GA104 [GeForce RTX 3070 Ti] driver: nvidia v: 470.182.03
  Device-3: Logitech StreamCam type: USB
    driver: hid-generic,snd-usb-audio,usbhid,uvcvideo
  Display: server: X.Org v: driver: X: loaded: nvidia
    gpu: vfio-pci,nvidia resolution: 1: 1920x1080~60Hz 2: 3840x2160
    3: 1920x1080~60Hz
  OpenGL: renderer: NVIDIA GeForce RTX 3070 Ti/PCIe/SSE2
    v: 4.6.0 NVIDIA 470.182.03

No AMD iGPU / APU in this system.

However my System76 Kudu6 laptop with Ryzen 9 5900HX, Radeon RX Vega 8
APU boots -71 just fine on the first try, no issue at all.

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  Kernel 5.15.0-71 fails to boot on Ubuntu 22.04 (possibly specific to
  Ryzen APUs)

Status in linux package in Ubuntu:

Bug description:
  Since upgrading to 5.15.0-71 a couple of days ago, my PC sporadically
  fails to boot. I see the following error messages:

  "error: cannot allocate kernel buffer
  error: you need to load the kernel first.

  Press any key to continue..._ "

  I am then returned to the GRUB boot menu.

  This has also been experienced by two other AskUbuntu users:
  cannot-allocate-kernel-buffer-you-need-to-load-kern . The common theme
  appears to be Ryzen APUs; two of us have 3400Gs and one has a 7600.

  In my case, the issue appears to be more likely to occur when I have
  to force-reboot because the system is frozen (due to a separate bug
  which I will link when I can find it again). But I have not yet
  reproduced it.

  Also the log files attached to this report may not contain relevant
  information as the last couple of boots worked correctly. I will try
  to capture a relevant kernel log now that I know this is a kernel

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: linux-image-5.15.0-71-generic 5.15.0-71.78
  ProcVersionSignature: Ubuntu 5.15.0-71.78-generic 5.15.92
  Uname: Linux 5.15.0-71-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.4
  Architecture: amd64
   /dev/snd/controlC1:  matthew    1288 F.... pulseaudio
   /dev/snd/controlC0:  matthew    1288 F.... pulseaudio
  CasperMD5CheckResult: pass
  CurrentDesktop: KDE
  Date: Thu Apr 27 17:49:11 2023
  InstallationDate: Installed on 2022-01-14 (467 days ago)
  InstallationMedia: Kubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  MachineType: Micro-Star International Co., Ltd. MS-7B89
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-71-generic 
root=UUID=7348d288-7351-45cd-8da2-592c59a4f7dd ro quiet splash
   linux-restricted-modules-5.15.0-71-generic N/A
   linux-backports-modules-5.15.0-71-generic  N/A
   linux-firmware                             20220329.git681281e4-0ubuntu3.12
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to jammy on 2022-05-26 (336 days ago)
  dmi.bios.date: 09/28/2021
  dmi.bios.release: 5.17
  dmi.bios.vendor: American Megatrends International, LLC.
  dmi.bios.version: 2.E3
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: B450M MORTAR MAX (MS-7B89)
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Micro-Star International Co., Ltd.
  dmi.chassis.version: 1.0
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: MS-7B89
  dmi.product.sku: To be filled by O.E.M.
  dmi.product.version: 1.0
  dmi.sys.vendor: Micro-Star International Co., Ltd.

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