Lol. I think I'm back to my original opinion. Ukrainian S-300.
The images are actually from Polish media, I've seen it. There is a short video too.
The fragment has been identified pretty conclusively as coming from a Ukrainian S-300. There is a reference fragment from Mikolaiv that is virtually identical to the one here. The fragment is identified as an end seal for the rocket motor. A KH-101 uses a turbofan...
The damage seems too light for a KH-101. The wooden corn cart is intact, just flipped on it's side but the tires are fine, the tractor paint is still shiny, and most of the timbers fell into the crater (covered pit?), they weren't blasted away.
Russia has no forces in S-300 range, so it would have to have come from Belarus, and that makes no sense because nothing else was being fired from Belarus and why would they target a farm anyway?