Please provide the following when creating the Ticket:

Game Version number: 1.2.1.202
Modded?: No
If modded, please list the mods:

Issue Description:
When defending a base I can go to the command tent and try to build. There will be a message: "building unavailable, enemy within the area". This has gave me an unfair advantage several times after I thought the base was clear to keep alert and check everywhere. Likewise when I have been attacking and hidden, I have heard on proxy chat someone say: someone's still around, we can't build. This leads to an unintended advantage.