Update broke ldap "No user provided"

After updating server from 2.9 to 2.10 we are no longer able to log in with ldap.
ldap login attempt returns an error "No user provided"

local credentials still work, and ldap configuration is unchanged.

Server info:

Centos7 3.10.0-1160.6.1.el7.x86_64

PHP 7.3.24

web server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips

database server: PHP/7.3.24 mod_perl/2.0.11 Perl/v5.16.3

MariaDB Server version 5.5.68-MariaDB