[ server_mode ] Cannot connect , 1970-01-01 Timestamp for latest handshake, no data sent to client

## What happened ?

* openvz machine ( yes , creepy :D )

* trying to replace wireguard go with boringtun results in "nothing" ( no bytes sent back to client )

## How did that happen ?

( before )
```
wireguard-go thingy
wg setconf thingy /etc/wireguard/thingy.conf

```

(after)
```
screen -dmS wireguard boringtun-cli -f --disable-drop-privileges thingy
WG_QUICK_USERSPACE_IMPLEMENTATION=boringtun-cli wg-quick up thingy
wireguard-go thingy
```
## Did it produce some logs ?

Client does not receive any byte

The Server says

```
peer: abcde/FGEHJ=
preshared key: (hidden)
endpoint: w.x.y.z:49861
allowed ips: 10.1.1.101/32, fdbe:1111:1111:110::/60
latest handshake: 53 years, 129 days, 9 hours, 19 minutes, 16 seconds ago
transfer: 216 B received, 486 B sent
```

* regular wireguard(-go) says "never" instead of 53 years ago ( unix TS 0 == 1970-01-01)
* regular wireguard(-go) works under same conditions

Any ideas ?

Regards