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Apparently the propellant they used was found (after launch, unfortunately) to be unreliable in a vacuum.

Ouch. This strikes me as a particularly avoidable mistake.

It's not that they don't work in vacuum, it's that they don't work after a decade in extremely cold vacuum.

... unlike a not-so-harsh room-temperature vacuum ;)

OK, after a decade extremely cold and in a vacuum.

The thrusters to counteract the force of the harpoons were bust.

ten years at near absolute zero?