3 engies who used exploits

I was on a valve server when 3 engies were using an penetrable block of concrete to place sentries into. That was on koth_harvest_final. I have some screenshots and, if we will ask other players, they should say something about this. btw. They said that ther are from Valve. :/There are 4 penetrable blocks on the entire map!Wolf, DestinyHero and Karuari.I'm sorry that I wrote this there but I can't report with more than one pic :/