By default, you can not take a robot destruction flag out of the trigger_rd_vault_trigger unless your team has 25 points. Is there a way to change this number? It's not in properties, and I can't find any documentation.
I'm fairly sure this is impossible to do, so there isn't really anything that can be said on it. It'd be nice though, along with robot model changing properties rather than only the three, wonder if someone in contact with valve could suggest such additions. Interesting to see you doing an RD map now though, don't know why a couple of people have suddenly after nobody but myself for years but hey, not like I can complain