CI web console terminates with job

Summary

When attaching to web console, the console stops when the job exists

Just for the record, session_timeout is set

[session_server]
  listen_address = "0.0.0.0:8093"
  advertise_address = "wptsrv2.deif.com:8093"
  session_timeout = 1800

I se the bug on our own server, I do not have the web console option on gitlab.com

Steps to reproduce

1. Start the project below
2. Connect web console
3. do ps -ef
4. kill the sleep

Now the console exits

Example Project

https://gitlab.com/kfc1/consoletest

What is the current bug behavior?

Web console exists before server_timeout

What is the expected correct behavior?

It should be possible to use the console for 1800 second after the job has finished.

Relevant logs and/or screenshots

root@runner-bxe1bquj-project-967-concurrent-0:/# ps -a
  PID TTY          TIME CMD
   26 pts/0    00:00:00 ps
root@runner-bxe1bquj-project-967-concurrent-0:/# ps -ef
UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 10:17 ?        00:00:00 /bin/bash
root         7     1  0 10:17 ?        00:00:00 /bin/bash
root         9     7  0 10:17 ?        00:00:00 sleep 120
root        10     0  0 10:17 pts/0    00:00:00 /bin/bash
root        27    10  0 10:18 pts/0    00:00:00 ps -ef
root@runner-bxe1bquj-project-967-concurrent-0:/# kill 9
root@runner-bxe1bquj-project-967-concurrent-0:/# 

Results of GitLab environment info

Running with gitlab-runner 13.10.0 (54944146)