Probably not rot but just the nature of these newer floors.
The floors are made from VERY thin boards sandwiched around styrofoam and installed over floor bracings that are typically pretty far apart. If the glue holding it all together was applied too thin in a certain spot, it will break the sandwich loose and you will have a spongy place.
Only solution I have heard or read about is to either remove the sealed underbelly and see if a brace can be added where the trouble spot is or have the floor replaced.
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