Short answer no. They can be dead and still sink. I think that you still have a chance with 3-5 yo pea seed for some to germinate. If I'm going to soak pea or bean seed I don't do it for much more that 8 or 10 hours and then drain them. In other words you treat them just like you where doing mung bean sprouts. I've both presoaked the seed and just planted it. I'm not sure that it makes a difference. If you are two days into pre-germinating the pea seed I think they don't do as well as just planting them. I think the handling of the seeds after they start to germinate damages them somehow. This is just my impression I haven't done any controlled experiments.
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