The text you never want to get from your builder

The builders are working busily.  Inspections are being passed.  Sheet rock is going up.  Then, I get this photo and message from the builder.

Stop the presses!  You mean to tell me that a) the plumber never did this b) both my husband and the builder also missed this and c) it passed inspection?  Seriously???? And, of course, this was only caught after the sheet rock went up, making it more expensive to find a spot to tap on and run the line.  Obviously, it was the plumber's responsibility, but shouldn't the builder have caught this before now? I'm trying to just let things go, but this is becoming typical of our experience.  Do something, later realize there's been a mistake, and then have to go back and redo it (for more money, of course).  Ugh.