gpg --version:

gpg (GnuPG) 2.2.8
libgcrypt 1.8.3
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 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/.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

gnupg-agent.conf:

no-grab
default-cache-ttl 86400
max-cache-ttl 86400
enable-ssh-support
debug-all
debug ipc
debug-level expert
log-file /tmp/gpg-agent.log

logs:

2018-07-20 14:48:10 gpg-agent[15679] DBG: chan_11 -> SERIALNO
2018-07-20 14:48:14 gpg-agent[15679] DBG: agent_cache_housekeeping
2018-07-20 14:48:15 gpg-agent[15679] DBG: chan_11 <- S SERIALNO <redacted>
2018-07-20 14:48:15 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:15 gpg-agent[15679] DBG: chan_11 -> GETINFO card_list
2018-07-20 14:48:15 gpg-agent[15679] DBG: chan_11 <- S SERIALNO <redacted>
2018-07-20 14:48:15 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:15 gpg-agent[15679] DBG: chan_11 -> SERIALNO --demand=<redacted>
2018-07-20 14:48:18 gpg-agent[15679] DBG: agent_cache_housekeeping
2018-07-20 14:48:22 gpg-agent[15679] DBG: agent_cache_housekeeping
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- S SERIALNO <redacted>
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 -> GETATTR $AUTHKEYID
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- S $AUTHKEYID OPENPGP.3
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 -> GETATTR SERIALNO
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- S SERIALNO <redacted>
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 -> READKEY OPENPGP.3
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- [ <redacted> ]
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 -> GETATTR $DISPSERIALNO
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- S $DISPSERIALNO <redacted>
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:24 gpg-agent[15679] ssh request handler for request_identities (11) ready
2018-07-20 14:48:24 gpg-agent[15679] ssh request handler for sign_request (13) started
2018-07-20 14:48:24 gpg-agent[15679] DBG: chan_11 -> SERIALNO --demand=<redacted>
2018-07-20 14:48:26 gpg-agent[15679] DBG: agent_cache_housekeeping
2018-07-20 14:48:30 gpg-agent[15679] DBG: agent_cache_housekeeping
2018-07-20 14:48:34 gpg-agent[15679] DBG: agent_cache_housekeeping
2018-07-20 14:48:38 gpg-agent[15679] DBG: agent_cache_housekeeping
2018-07-20 14:48:41 gpg-agent[15679] DBG: chan_11 <- S SERIALNO <redacted>
2018-07-20 14:48:41 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:41 gpg-agent[15679] DBG: detected card with S/N <redacted>
2018-07-20 14:48:41 gpg-agent[15679] DBG: chan_11 -> SETDATA <redacted>
2018-07-20 14:48:41 gpg-agent[15679] DBG: chan_11 <- OK
2018-07-20 14:48:41 gpg-agent[15679] DBG: chan_11 -> PKAUTH OPENPGP.3
2018-07-20 14:48:41 gpg-agent[15679] DBG: chan_11 <- [ <redacted> ]
2018-07-20 14:48:41 gpg-agent[15679] starting a new PIN Entry
2018-07-20 14:48:41 gpg-agent[15679] DBG: connection to PIN entry established