Here is a decent one talking about the decreased tensile strength of products made from recycled polyamides. Though I'd like to hear HGL's input as well. Going to a different setting and hoping it's a good analogy, It seems to make sense from the organic synthesis standpoint. Once you allow it to happen, runaway polymerization is one of the easiest ways to obliterate your product (e.g. decarboxylation of salicylic acid to phenol). All you need is heat and impurities that act akin to nucleation sites for growing crystals.
That paper is about polymers, though, and the whole fun of SLS is powdered metal. I have no doubts that getting a polymer melty-adjacent makes the remelt janky. If you're talking about steel, aluminum or titanium, though, you're at basic-bitch cast level anyway.