Falcon 9 second stage engine anomaly

I woke up in the morning to see that last night there was an anomaly on the second stage of a Falcon 9 launch. Definitely looks like a fuel leak in the engine covering thingy. But the anomaly happened when the second stage engine failed to restart. The Starlinks are deployed in a lower than intended orbit. We don't know if this will affect other Falcon 9 launches going forward.
(Update: It looks like that the Falcon 9 launches going forward are being on hold until SpaceX & the FAA can do there mishap investigation.)
SpaceX confirmed that the second stage experience a liquid oxygen leak which later cause a RUD with the second stage engine relight. The Starlinks will be burned up in the Earth's atmosphere due to unable to increase orbit.

[@edvisme]

Wonder what they are using for 2nd stage fuel. NT04/MMH? or? Looks to be "icing up".