dlopen failure loading after upgrade from 10.2.6 to 10.2.8

deb [arch=amd64] http://ftp.ubuntu-tw.org/mirror/mariadb/repo/10.2/debian stretch main

# postmap -q email1@example.com mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf

# apt update

Ign:1 http://mirrors.online.net/debian stretch InRelease

Hit:2 http://mirrors.online.net/debian stretch Release

Hit:3 http://security.debian.org/debian-security stretch/updates InRelease

Get:5 http://ftp.ubuntu-tw.org/mirror/mariadb/repo/10.2/debian stretch InRelease [3,872 B]

Fetched 3,872 B in 2s (1,560 B/s)

Reading package lists... Done

Building dependency tree

Reading state information... Done

9 packages can be upgraded. Run 'apt list --upgradable' to see them.

# apt dist-upgrade

Reading package lists... Done

Building dependency tree

Reading state information... Done

(Reading database ... 36776 files and directories currently installed.)

Preparing to unpack .../mariadb-server-10.2_10.2.8+maria~stretch_amd64.deb ...

/var/lib/mysql: found previous version 10.2

Unpacking mariadb-server-10.2 (10.2.8+maria~stretch) over (10.2.6+maria~stretch) ...

Preparing to unpack .../mariadb-client-10.2_10.2.8+maria~stretch_amd64.deb ...

Unpacking mariadb-client-10.2 (10.2.8+maria~stretch) over (10.2.6+maria~stretch) ...

Preparing to unpack .../mariadb-server-core-10.2_10.2.8+maria~stretch_amd64.deb ...

Unpacking mariadb-server-core-10.2 (10.2.8+maria~stretch) over (10.2.6+maria~stretch) ...

Selecting previously unselected package libnuma1:amd64.

Preparing to unpack .../libnuma1_2.0.11-2.1_amd64.deb ...

Unpacking libnuma1:amd64 (2.0.11-2.1) ...

Setting up libmariadb3 (10.2.8+maria~stretch) ...

Setting up libnuma1:amd64 (2.0.11-2.1) ...

Setting up libmariadbclient18 (10.2.8+maria~stretch) ...

Processing triggers for libc-bin (2.24-11+deb9u1) ...

Processing triggers for systemd (232-25+deb9u1) ...

Processing triggers for man-db (2.7.6.1-2) ...

Setting up mariadb-server-core-10.2 (10.2.8+maria~stretch) ...

Setting up mariadb-client-core-10.2 (10.2.8+maria~stretch) ...

Setting up mariadb-client-10.2 (10.2.8+maria~stretch) ...

Setting up mariadb-server-10.2 (10.2.8+maria~stretch) ...

Setting up mariadb-server (10.2.8+maria~stretch) ...

# postmap -q email1@example.com mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf

postmap: fatal: load_library_symbols: dlopen failure loading /usr/lib/postfix/postfix-mysql.so: /usr/lib/x86_64-linux-gnu/libmariadbclient.so.18: version `libmariadbclient_18' not found (required by /usr/lib/postfix/postfix-mysql.so)