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Yea, the super heavy booster was flying a refurbished engine from a previous super heavy flight.

Explosion was probably expected.

(It's actually the entire booster reflying this time; the reflown single engine was in January).

Oh, so it's one of the two boosters they caught with the chopsticks?

Dang, that's actually quite insane.

Shame that block2/block3 starship is such a mess.

The intended goal is to reuse those boosters, more than once, and without requiring weeks of inspection and maintenance.