Bots disappear after last player leaves

[SpringChicken]

Hi guys,
I'm from the =SASS= gaming community, and we recently started running an RO2 dedi server. We tried to put bots on our server so that we have something to play against whilst we try to fill our server up, but there is a problem.

I've searched the forums but couldn't find a definitive answer to this.

The admin put in bots, which work fine whilst people are playing in the server, or before anyone joins, but once real players have joined and then the last human leaves, all the bots disappear from the server.

Can someone please give us a definitive answer to this.
Many thanks