What failure mode was critically highlighted by the Starship SN10 post-landing sequence?

Answer

Accumulation and ignition of unspent propellant vaporized by impact.

The failure sequence following SN10's touchdown involved either excessive impact force or, critically, the accumulation and subsequent ignition of unspent propellant vaporized by the impact or the final engine firing.

What failure mode was critically highlighted by the Starship SN10 post-landing sequence?

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