Our FC was one of the affected (all 20 are from our FC, rolled a 0 winner)
We also noticed that during the bidding phase, the plot said "You have submitted a lottery entry for plot 2, ward 60, Empyreum." We just thought it was a funny error in reading out the message at the time. (the real plot is ward 2 plot 60, cact)
Perhaps these two bugs are related? Like its trying to pull results from a house that dont exist? (Ward 60 isnt real)