Was it just data?
From what I see from my logs there was no live / historical data available during whole US Stocks pre-market session till 12/07 15:41:46.066 UTC (1h 11 min after the open).
Some resting orders did get filled 21 and 48 mins after the open (seems like roughly around the time price touched, as expected). So maybe execution was not impacted. Could be just data?
First time this year that my automation got impacted. It will be clear how much after the close.
On a good side - comparing to what other brokerages had this year, this is nothing..
Val