Fails signing key with Yubikey

[Alexis]

Dear GnuPG,

     I'm trying to sign a secondary key with my yubikey, however it fails saying the private key is not found. I'm able to sign files with `--sign`, but am not able to use `--sign-key`. This issue was posted about by someone else at https://dev.gnupg.org/T6411



```

gpg --version                                                 
gpg (GnuPG) 2.4.5 
libgcrypt 1.10.3-unknown 
Copyright (C) 2024 g10 Code GmbH 
License GNU GPL-3.0-or-later <https://gnu.org/licenses/gpl.html> 
This is free software: you are free to change and redistribute it. 
There is NO WARRANTY, to the extent permitted by law. 
 
Home: /home/alexis/.gnupg 
Supported algorithms: 
Pubkey: RSA, ELG, DSA, ECDH, ECDSA, EDDSA 
Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH, 
        CAMELLIA128, CAMELLIA192, CAMELLIA256 
Hash: SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224 
Compression: Uncompressed, ZIP, ZLIB, BZIP2
```


```

gpg -K --with-colon 20E0635864445A177F8F7C0C6141FD27892AE9B4 
sec:u:255:22:6141FD27892AE9B4:1700197485:::u:::cESCA:::#::ed25519:::0: 
fpr:::::::::20E0635864445A177F8F7C0C6141FD27892AE9B4: 
grp:::::::::1486B645AD4F1642BEDDA35BE0A03E24176B8736: 
uid:u::::1700197485::27E90DFEEB5D485431C85BC651668AB9FEC8A169::Alexis <mailto:alexis at catgirl.land>::::::::::0: 
ssb:u:255:22:D0753D43F3C7A942:1700197520:1731733520:::::s:::D2760001240103040006250173860000::ed25519:: 
fpr:::::::::13511F6F0880AABD07AA1035D0753D43F3C7A942: 
grp:::::::::A8919684010395C76A981BB322E13011DEA9E1CC: 
ssb:u:255:18:90A11AD910FBE44E:1700197567:1731733567:::::e:::D2760001240103040006250173860000::cv25519:: 
fpr:::::::::B5B4442C9A5104824B0F0DA390A11AD910FBE44E: 
grp:::::::::583172CF6C0231FD03CDFC174A081F13EA565480: 
ssb:u:255:22:3A7E3018D78FC26A:1700197579:1731733579:::::a:::D2760001240103040006250173860000::ed25519:: 
fpr:::::::::1B10245AA781FC2BDADB4BB93A7E3018D78FC26A: 
grp:::::::::C3F9CAF98B582FC5BD82862F27E008C713F8536F:
```



Thanks,

Alexis
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