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If the broken spring clearly had a crack that had gotten rusty over time, it would explain the result. Given that I'd thoroughly inspect the other side. If it looks 100% then probably good to go. If it looks iffy / has some hairlines of rust in it, get it done at the same time.
It sounds like a potential manufacturing issue given that they all seem to break the last little bit and not change the ride height. It doesn't seem like a random thing to have the results so consistently similar. Like a coating didn't get put on correctly, or got cut into at a later manufacturing step.
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