Zkunlockifs on Debian 12 cannot detect zymkey

Hello.
I’ve recently LUKS-encrypted one of Pi 4B with Debian 12 using Zymkey.
Earlier this year there were troubles booting Debian 12 due to change of GPIO numbering. So I have /var/lib/zymbit/zkenv.conf with “ZK_GPIO_WAKE_PIN=516” in it.
My Pi boots OK, zkifc.service does not report any issue.
However when I run zkunlockifc it fails with “ERROR: no zymkeys installed.”
I run zkunlockifc with strace and it tries to open /sys/class/gpio/gpio4 even with /var/lib/zymbit/zkenv.conf configured.

Is it a known issue that will be fixed soon? Is there any workaround?

# dpkg -l | grep zk
ii  libzk                                1.1-22                                  arm64        Zymkey Base Communications Library
ii  zkapputilslib                        1.1-25                                  arm64        Zymkey User API
ii  zkbootrtc                            1.1-15                                  arm64        Zymkey RTC retrieval standalone app
ii  zkifc                                1.2-36                                  arm64        Zymkey Interface Connector
ii  zkpkcs11                             1.0-3                                   arm64        Zymkey PKCS11 Library
ii  zksaapps                             1.0-16                                  arm64        Stand alone zymkey apps

# cat /var/lib/zymbit/zkenv.conf
ZK_GPIO_WAKE_PIN=516

# systemctl status zkifc
● zkifc.service - Zymkey Interface Connector
     Loaded: loaded (/etc/systemd/system/zkifc.service; enabled; preset: enabled)
     Active: active (running) since Sun 2024-06-09 12:33:04 CDT; 11min ago
    Process: 5808 ExecStartPre=/bin/bash -c mkdir -p /run/zkstatus && chown -R zymbit.zymbit /run/zkstatus (code=exited, status=0/SUCCESS)
    Process: 5812 ExecStartPre=/bin/sleep 0.5 (code=exited, status=0/SUCCESS)
   Main PID: 5813 (zkifc)
      Tasks: 3 (limit: 3907)
        CPU: 1.453s
     CGroup: /system.slice/zkifc.service
             └─5813 /usr/bin/zkifc -s /var/lib/zymbit/

Jun 09 12:33:03 nagios-disp1 systemd[1]: Starting zkifc.service - Zymkey Interface Connector...
Jun 09 12:33:03 nagios-disp1 bash[5808]: chown: warning: '.' should be ':': ‘zymbit.zymbit’
Jun 09 12:33:04 nagios-disp1 systemd[1]: Started zkifc.service - Zymkey Interface Connector.

# ll /proc/`pidof zkifc`/fd
...
/sys/devices/platform/soc/fe200000.gpio/gpiochip0/gpio/gpio516/value
...

# lsblk
NAME         MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINTS
mmcblk0      179:0    0 29.5G  0 disk  
├─mmcblk0p1  179:1    0  512M  0 part  /boot/firmware
└─mmcblk0p2  179:2    0   29G  0 part  
  └─cryptrfs 254:0    0   29G  0 crypt /

# uname -a
Linux nagios-disp1 6.6.31+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.31-1+rpt1 (2024-05-29) aarch64 GNU/Linux

# cat /etc/debian_version 
12.5

# zkunlockifs /var/lib/zymbit/key.bin.lock > /tmp/key.bin
ERROR: no zymkeys installed.

# strace zkunlockifs /var/lib/zymbit/key.bin.lock
...
openat(AT_FDCWD, "/dev/i2c-1", O_RDWR|O_EXCL) = 6
close(6)                                = 0
faccessat(AT_FDCWD, "/sys/class/gpio/gpio4", F_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/sys/class/gpio/export", O_WRONLY) = 6
write(6, "4\n\0", 3)                    = -1 EINVAL (Invalid argument)
close(6)                                = 0
...
faccessat(AT_FDCWD, "/sys/class/gpio/gpio4", F_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/sys/class/gpio/export", O_WRONLY) = 6
write(6, "4\n\0", 3)                    = -1 EINVAL (Invalid argument)
close(6)                                = 0
write(2, "ERROR: no zymkeys installed.\n", 29ERROR: no zymkeys installed.
) = 29
...