entrypoint.sh does not correctly create servers with the <gamename>-<number> specification

[Neo-Desktop]

as the title states - a server with the name l4d2server is created correctly
but a server with the name l4d2server-2 does not get created

I'm following instructions from the guide as seen here:
https://docs.linuxgsm.com/features/multiple-game-servers

this is my log output:

l4d2server-2  | loading exit trap
l4d2server-2  | Welcome to the LinuxGSM Docker
l4d2server-2  | ================================================================================
l4d2server-2  | GAMESERVER: l4d2server-2
l4d2server-2  | UID: 1000
l4d2server-2  |
l4d2server-2  | LGSM_GITHUBUSER:
l4d2server-2  | LGSM_GITHUBREPO:
l4d2server-2  | LGSM_GITHUBBRANCH:
l4d2server-2  |
l4d2server-2  | Initalising
l4d2server-2  | ================================================================================
l4d2server-2  | update permissions for linuxgsm
l4d2server-2  | creating ./l4d2server-2
[ FAIL ] unknown game server
l4d2server-2  | starting cron
l4d2server-2  |
l4d2server-2  | update l4d2server-2
l4d2server-2  | ./entrypoint.sh: line 54: ./l4d2server-2: No such file or directory
l4d2server-2  |
l4d2server-2  | start l4d2server-2
l4d2server-2  | ./entrypoint.sh: line 58: ./l4d2server-2: No such file or directory
l4d2server-2  | ./entrypoint.sh: line 60: ./l4d2server-2: No such file or directory