Did the second shop mag the crankshaft after turning the journal down? If not, they did you a dis-service and you have an unknown. A crack that is that shallow is uncommon, but not impossible. I would not install the crankshaft until you get it checked again, and checked very closely to make sure. Sometimes you can tap the crankshaft throw with a small ball peen hammer and it will ring, and if there is a crack, it will be a dull sound, not a clear ringing like a crankshaft with no issues. Joe-JDC