Ubuntu with Kernel 5.11.0-46 won't load/boot

Question

This morning, I updated Ubuntu to use kernel 5.11.0-46 as recommended by the software updater. However, Ubuntu won't load after the update.

I am able to get to GRUB and select 5.11.0-44 as the kernel and get into Ubuntu but I'm not sure how I can address this issue long term. I tried changing the default kernel that GRUB uses as follows:

GRUB_DEFAULT=Ubuntu, with Linux 5.11.0-44-generic
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.ppfeaturemask=0xfffd7fff"
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0

This, however, did not improve matters and it still causes the OS to not load after GRUB. I even tried to remove the quiet splash to see if I could get the verbose OS load to no avail.

Any ideas how to address this? I want to understand why this is happening and what I can do to help solve this issue.

UPDATE: Had incorrect entry in GRUB_DEFAULT:

GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 5.11.0-44-generic"
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.ppfeaturemask=0xfffd7fff"
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0

Also, had forgotten to update GRUB after modifying the file:

sudo update-grub

I can now boot into 5.11.0-44 by default.

I’ll file a bug as recommended in the comments so this gets tracked correctly.