x488 vs all other : keyid flip

[Christian Sommer]

hi.
i scrutinized the new, announcements, mailinglist history and the ietf
drafts but still couldn't find out the reason for following observation.

let's say we have an ed25519 key with the 40 hex character fingerprint of
1111 2222 3333 4444 0000 0000  AAAA BBBB CCCC DDDD then its long keyid is
AAAA BBBB CCCC DDDD and its short keyid is CCCC DDDD.

on the other hand a x488 fingerprint is 50 hex characters long. let's say
it's 11111 22222 33333 44444 00000 00000 AAAAA BBBBB CCCCC DDDDD then its
long keyid is 11111 22222 33333 4 and its short keyid is 22 33333 4.

at least that is what gpg 2.4.4 displays. please shed some light on that
observation.
liberal regards,
chris
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