In fact, I would say that the heart of GR is the idea that space-time is a dynamical entity, and thus can support a wide range of behaviors. Exact solutions are rare, and when they do arise, they tend to be highly idealized. The rest of us are stuck dealing with the messy real world, where we have to try to understand how the actual stress-energy of the universe shapes the actual space-time of the universe.In summary, when you compress a spring beyond its most relaxed point, it stores more energy and produces a stronger gravitational field than an uncompressed spring. However, if you pull the spring in the opposite direction and stretch it beyond its most relaxed point, it will produce a weaker gravitational field, but
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And moreover, that added mass-energy is removed from the mechanism or agent which did the compressing.