They've been firing them on the ground pretty often and didn't catch it, so clearly the filtration issues only happen when actually flying. And, of course, tha

They've been firing them on the ground pretty often and didn't catch it, so clearly the filtration issues only happen when actually flying. And, of course, that's still overlooking all the other tests they were able to do. They were able to verify that hotstaging will work, they were able to get the basic concept of the propellant transfer to work and they got data on reentry heating as well as on the viability of using Starlink to transmit through reentry.