Debian Buster container does not start on OpenVZ 7

>Description of problem:
Debian 10 (Buster) containers does not start.

>Steps to Reproduce:
1. Dist-upgrade a Debian stretch container to Debian Buster
2. Try to retart it

>Actual results:
{{# vzctl start 3984
Starting Container ...
Container is mounted
Os release: 4.14.0
[...]
* pivot_root /var/lib/vz/root/3984a000-7059-9b7d-ea43-59b7dea43da0
Setup devtmpfs
vzctl: relocation error: /lib/x86_64-linux-gnu/libnss_files.so.2: symbol __libc_readline_unlocked, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
* Done wait status start ret=0 errcode=0
Failed to start the Container, status pipe unexpectedly closed
* Failed to configure [3]
Container is unmounted
vcmmd: unregister
* Destroy cgroup
Failed to start the Container
Unlock fd=5}}

>Expected results:
The container to start.

>Host OS:
Virtuozzo Linux release 7.6 - kernel 3.10.0-957.12.2.vz7.86.2

>Guest OS:
Debian 10.0

>Additional info (see https://openvz.org/Reporting_OpenVZ_problem):
I tried to set OSRELEASE="4.14.0" on the container config but it not fixing the issue.

I chrooted the container and reinstalled the libc6 package which contains both libnss_files.so.2 and libc.so.6 to be sure the issue wasnt there.