I am using gpg (GnuPG) 2.2.19 / libgcrypt 1.8.5 on Debian Testing (11) and trying to use trusted-key 69FF455A869F9031A691E0F199392F62BAE30723 in my gpg.conf as I am in understanding that long key IDs are also at collision risk and I should use fingerprints everywhere where it's possible.
However that makes all commands error
gpg: '69FF455A869F9031A691E0F199392F62BAE30723' is not a valid long keyID
and while the manual says that the option takes a long key ID, I think it should also accept a fingerprint which is also the impression I got on #gnupg on freenode.