GnuPG cannot import sq exported subkey

When I export subkey using sq key subkey export, and use gpg --import, gpg says it has bad signature. Example:

$ sq key list --cert-email=ljkgpxs@gmail.com
 - E2CE591A215497F7F2879F27FCF0ED6E8C4619CA
   - user IDs:
     - ljkgpxs <ljkgpxs@gmail.com> (authenticated)
     - ljkgpxs <ljkgpxs@outlook.com> (authenticated)
     - uasoft <uasoft@yeah.net> (authenticated)
   - created 2025-05-08 06:01:22 UTC

   - 2562258F030932FECEED07208BA86B4A5EF7A432
     - created 2025-05-08 06:01:22 UTC
     - usable for signing and decryption
     - @softkeys/E2CE591A215497F7F2879F27FCF0ED6E8C4619CA: available, locked
   - 9F8E18838D6C2C194A07D7520F88D7E954FFC2D5
     - created 2025-05-08 06:04:08 UTC
     - usable for signing and decryption
     - @softkeys/E2CE591A215497F7F2879F27FCF0ED6E8C4619CA: available, locked

$ sq key subkey export --cert=E2CE591A215497F7F2879F27FCF0ED6E8C4619CA --key=2562258F030932FECEED07208BA86B4A5EF7A432 | gpg --import
gpg: key FCF0ED6E8C4619CA: 1 bad signature
gpg: key FCF0ED6E8C4619CA: "ljkgpxs <ljkgpxs@gmail.com>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

sq and gpg version:

$ gpg --version
gpg (GnuPG) 2.4.7-unknown
libgcrypt 1.9.4-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: /c/Users/ljkgpxs/.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

$ sq version
sq 1.3.1
using sequoia-openpgp 2.0.0
with cryptographic backend Nettle 3.10 (Cv448: true, OCB: true)

Is there something wrong with my operation or is sq bug? How to fix this?