I wonder what the 'known issue' was that they found with the field. Since they're not going to tell us for a little while, this is my theory:
if you look at the
FMS Twitter Feed, you'll see one
tweet from the first playing of the first semifinal match. Notice that the hashtag denoting the field is "FRCTEST", not "FRCCMP",
like it should be (second linked tweet is the replay of that match). To me, this looks like the FMS was identifying itself as "test".
Not being extremely familiar with how the FMS works, I'm not sure how this would affect match operation, but this could possibly be what the field technicians found...