I did listen to a Bill Whittle podcast, a very bright guy an an aviation enthusiast, and he said he regarded those flames as a flaw in the test flight, so...he pays closer attention than I do (and is, I am sure, smarter than I am) to these things, so you may be right.
The burn-through on the control surface is a flaw as well...but we know they will eventually fix that!
Thanks, I’ll look him up!
It clearly didn’t have apparent impact on the landing and tower catch, so whatever it was, it must not have been serious. It may even have been necessary.