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It is true for maize that you can create an unstable hybrid, which has been used as a form of IP control by corn seed companies for longer than I have been alive. That is also true for numerous other plants. As far as I know, it is not possible to create an unstable soybean hybrid, which is why Monsanto went the licensing route.

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My understanding of beans is that it is possible, but not commercially feasible. Something about the yield of seeds per plant versus the effort to control the crossing of parental inbred lines.

What does unstable in this context exactly mean?

Chance of successful replication of the desirable traits to the offspring (seeds) of the plants

If you replant the unstable seed it might not germinate, if it does is likely to be stunted and sterile.

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