New Kernel of 26.7 crashes on APU2 board

[IVI053]

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Describe the bug

After upgrading from 26.1.11 to 26.7 on my APU2 hardware it ends up in a bootloop unable to finish the update. A immediate reboot occurs right after the "update in progress" banner shows up on the console. I was able to get it running again by selecting the old kernel in boot manager (option 6). After that it tries the update, finds the wrong kernel but proceeds with all following steps leading to a kind a working state. If I then try to boot the new kernel it goes into the bootloop again:

>>> Invoking early script 'watchdogd'
>>> Invoking early script 'upgrade'
>>> Invoking early script 'configd'
Starting configd.

PC Engines apu2
coreboot build 20230131
BIOS version v4.19.0.1
4080 MB ECC DRAM

To Reproduce

Steps to reproduce the behavior:

1. Update to 26.7 on APU2 hardware
2. See error

Expected behavior

Successful update like all the times before.

Relevant log files

Could not find any relevant information myself. Can provide on request

Additional context

Disabled watchdog to be sure it's not the culprit. No change

Environment

PC Engines apu2
coreboot build 20230131
BIOS version v4.19.0.1 (latest)

Last working release:

OPNsense 26.1.11_10-amd64
FreeBSD 14.3-RELEASE-p16
OpenSSL 3.0.21