This bug has been around for a while.
During daylight savings time the process that posts trade results to live ports stops running one hour earlier.
This causes any partially filled trades to be posted when the market opens the next day.
During standard time everything works perfectly, trades are posted 5 mins after they complete.
This sounds like a nit, but it will mess up a live port if you rebalance before yesterdays
trades are posted.
BTW the time new trades are first passed to IB also changes with DST.