Multiple attempts at system-upgrade from 40 to 41 across the last month or two.
Looking at the messages, it appears that there is some problem with the GPG keys.
Deleted the GPG keys and re-executed, but no luck.

dnf log:

2025-01-09T00:01:28-0500 DEBUG Using rpmkeys executable at /usr/bin/rpmkeys to verify signatures
2025-01-09T00:05:16-0500 CRITICAL Problem opening package dnf5-5.2.8.1-3.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package dnf5-plugins-5.2.8.1-3.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package kernel-6.12.11-200.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package kernel-core-6.12.11-200.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package kernel-modules-6.12.11-200.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package kernel-modules-core-6.12.11-200.fc41.aarch64.rpm
...
2025-01-09T00:05:16-0500 CRITICAL Problem opening package vim-enhanced-9.1.1081-1.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package vim-filesystem-9.1.1081-1.fc41.noarch.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package vim-minimal-9.1.1081-1.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package xxd-9.1.1081-1.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 CRITICAL Problem opening package zlib-ng-compat-2.2.3-1.fc41.aarch64.rpm
2025-01-09T00:05:16-0500 DDEBUG Cleaning up.
2025-01-09T00:05:17-0500 DDEBUG Plugins were unloaded.
2025-01-09T00:05:17-0500 SUBDEBUG 
Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/dnf/cli/main.py", line 67, in main
    return _main(base, args, cli_class, option_parser_class)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/dnf/cli/main.py", line 106, in _main
    return cli_run(cli, base)
           ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/dnf/cli/main.py", line 130, in cli_run
    ret = resolving(cli, base)
          ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/dnf/cli/main.py", line 183, in resolving
    base.do_transaction(display=displays)
  File "/usr/lib/python3.12/site-packages/dnf/cli/cli.py", line 248, in do_transaction
    self.gpgsigcheck(install_pkgs)
  File "/usr/lib/python3.12/site-packages/dnf/cli/cli.py", line 315, in gpgsigcheck
    raise dnf.exceptions.Error(_("GPG check FAILED"))
dnf.exceptions.Error: GPG check FAILED
2025-01-09T00:05:17-0500 CRITICAL Error: GPG check FAILED

Reproducible: Always

Steps to Reproduce:
1.dnf clean all
2.dnf system-upgrade download --releasever=41 -y
3.dnf system-upgrade reboot

(Removing GPG keys:  rpm -e `rpm -q -a | grep gpg-pubkey`
Actual Results:  
Boots back into 40 without any upgrade.

Expected Results:  
Boot into 41.