Telegram is going to be Telegram, but there is a bit of debunking going on there. (… if you even want to call it debunking. Telegram channels are extremely biased and quickly spread rumors, true or not.)
A passenger manifest for the plane was released and supposedly most of the Ukrainians on that list were traded months earlier.
Russians have quarantined the crash site and are not providing proof that Ukrainians were on the plane.
Only one body is shown amid the wreckage area, which is unusual for a plane that was supposed to be filled with prisoners.
That’s the current gossip, anyway. If it’s true or not, we will not actually know for a bit.