Libzymkeyssl upgrade fails

One of Pi’s on Debian failed to upgrade libzymkeyssl:

# dpkg --configure -a
Setting up libzymkeyssl (1.0-12) ...
/var/lib/dpkg/info/libzymkeyssl.postinst: line 5: [: /usr/lib/arm-linux-gnueabihf/engines-1.1: binary operator expected
cp: target '/usr/lib/aarch64-linux-gnu/engines-1.1/zymkey_ssl.so' is not a directory
dpkg: error processing package libzymkeyssl (--configure):
 installed libzymkeyssl package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 libzymkeyssl

# dpkg -l | grep libzymkeyssl
iF  libzymkeyssl                         1.0-12                             arm64        Zymkey SSL Engine Library

# cat /etc/debian_version 
11.11

# uname -a
Linux pi-nessus 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux

# find /usr/lib -name "engines-1.1"
/usr/lib/arm-linux-gnueabihf/engines-1.1
/usr/lib/aarch64-linux-gnu/engines-1.1