ext_session_acl can not initialize db via tdb_open()

[sergor75]

Ubuntu 20.04.4, squid-openssl 5.5

$ dpkg -l | grep squid
rc squid 4.10-1ubuntu1.5 amd64 Full featured Web Proxy cache (HTTP proxy)
ii squid-common 5.5-1 all Full featured Web Proxy cache (HTTP proxy) - common files
ii squid-langpack 20191103-1 all Localized error pages for Squid
ii squid-openssl 5.5-1 amd64 Full featured Web Proxy cache (HTTP proxy OpenSSL flavour)
ii squidclient 5.5-1 amd64 Full featured Web Proxy cache (HTTP proxy) - HTTP(S) message utility

$ id
uid=13(proxy) gid=13(proxy) groups=13(proxy),124(winbindd_priv)
$ ls -ld /var/lib/squid/
drwxr-xr-x 3 proxy proxy 53 Jun 27 17:37 /var/lib/squid
$ ls -l /var/lib/squid
total 0
-rw-rw---- 1 proxy proxy 0 Jun 27 17:37 session
-rw-rw---- 1 proxy proxy 0 Jun 27 16:54 session.db
drwxr-xr-x 3 proxy proxy 48 Jun 27 16:25 ssl_db

$ /usr/lib/squid/ext_session_acl -b /var/lib/squid/session.db
FATAL: /usr/lib/squid/ext_session_acl: Failed to open session db '/var/lib/squid/session.db'
$ /usr/lib/squid/ext_session_acl -b /var/lib/squid/
FATAL: /usr/lib/squid/ext_session_acl: Failed to open session db '/var/lib/squid/session'
$ /usr/lib/squid/ext_session_acl -b /var/lib/squid
FATAL: /usr/lib/squid/ext_session_acl: Failed to open session db '/var/lib/squidsession'

$ ldd /usr/lib/squid/ext_session_acl
linux-vdso.so.1 (0x00007ffeb83e5000)
libtdb.so.1 => /lib/x86_64-linux-gnu/libtdb.so.1 (0x00007fe13908d000)
libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fe138eab000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fe138e90000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fe138c9e000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fe138c7b000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fe138b2c000)
/lib64/ld-linux-x86-64.so.2 (0x00007fe1390ba000)