The command /spreadplayers seems to not work properly.
Trying to use this command: "spreadplayers 39 246 5 8 false @e[type=Bat,name=Waves]", the bat should be randomly teleported in a block at least 5 and at most 8 blocks away from the center. Instead, the bat doesn't moves and a strange error message appears: "Could not spread 1 players around 39.5,246.5 (too many players for space - try using spread of at most 340282..." and a lot of other digits.

Doesn't work either with larger radius, the only difference is that the entity is teleported in other places, but only in certain areas, not in the entire radius.