I have noticed an issue, that was reported already by some, using the new UI:
If you’re on the new UI and working on a machine in the RA, it is just fine. However, if the machine leaves the RA and you try to connect to it through the LAB connection pack, you won’t be able to do so, as the UI will never show the LAB IP (10.10.x.x).
So basically, you’re in totally different subnets, unless you switch to classic UI and reveal the 10.10.x.x IP.
Moreover, even trying to connect to (join) ANY machine will show you the same IP address of the machine that left the RA.
I think I’ll stick to the classic HTB permanently until this is fixed.