This problem was likely triggered by apt upgrading amd64-microcode
recently, /var/log/apt/history.log contains:

amd64-microcode:amd64 (3.20231019.1ubuntu2.1,
3.20250311.1ubuntu0.24.04.1)

The kernel now wants to update the firmware in early boot:

[    0.001712] microcode: CPUID(1).EAX: 0xa50f00, current revision: 0xa500011
[    1.139893] microcode: Current revision: 0x0a500011
[    1.139917] microcode: Updated early from: 0x0a50000f

This did not happen before.

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https://bugs.launchpad.net/bugs/2114974

Title:
  microcode: You should not be seeing this.

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