I have a Raspberry Pi running a custom Yocto image and it's using systemd-journald for logging.

I'm wondering why there is a difference between:

root@raspberrypi4:~# journalctl -o verbose | grep -e '_MACHINE_ID\|_BOOT_ID' | sort -u
root@raspberrypi4:~# journalctl --list-boots
    -1 1a58eca1b2554b04b0e5177cea29f34a Mon 2020-08-17 20:56:36 UTC—Tue 2020-11-24 07:43:35 UTC
     0 16ab74cb7f454a879de7775ea519a0a1 Tue 2020-11-24 07:43:35 UTC—Tue 2020-11-24 10:12:29 UTC

I obviously have eleven different _BOOT_IDs in the journal but --list-boots only shows two. Why is that?

I'm running systemd 243 and Linux raspberrypi4 4.19.93

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