I think we've got the same problem after upgrade to 7.2.106.48
A lot of non-active PCs, although they are active (ping is ok)
We don't work with LSAgent, only AD scanning.
I discovered in the tab Comments, that the device seems to change the name from Netbios Domain name to DNS Domain name. At the next scanning back to Netbios and so on. We didn't have this before.